Question Cannot (un)subscribe to Forum Category - K6.0

When I want to subscribe or to unsubscribe to a Category I get an error '404 Component not found' with the message "The requested page can not be found". There was no problem with (un)subscribtion a week ago, so some must have been changed in my Joomla 4 installation I think, but I can not discover what is causing this problem. Any suggestion..??

if it worked well first what did you adjust an Update Joomla or something in the seo settings changed
eg Search Engine Friendly URLs turned off or Use URL Rewriting
Or did you install new extensions?
otherwise post your configuration report here
www.kunena.org/docs/en/manual/backend/to...report-configuration

Database collation check: The collation of your table fields are correct
        

Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |
        

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 756M | Max file upload:  

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
851	Forum	kunenamenu	view=home&defaultmenu=853	forum	No
852	Index	kunenamenu	view=category&layout=list	forum/index	No
853	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
854	Unread	kunenamenu	view=topics&layout=unread	forum/unread	No
855	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
856	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
857	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
858	Profile	kunenamenu	view=user	forum/profile	No
859	Help	kunenamenu	view=misc	forum/help	No
860	Search	kunenamenu	view=search	forum/search	No
861	Forum	mainmenu	Itemid=851	kunena-2022-05-11	No
862	CeesTon	horizontaal	view=category&layout=list&catid=0	ceeston	No

Joomla default template details : cassiopeia | author: Joomla! Project | version: 1.0 | creationdate: 2017-02

Kunena default template details : Aurelia | author: Kunena Team | version: 6.0.2 | creationdate: 2022-08-15

Kunena template params:

Warning: Spoiler!

DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	1
borderless	1
tooltips	1
SubjectLengthMessage	80
fullactions	1
quick	0
displayMenu	1
displayDropdownMenu	1
displayDropdownContent	1
displayModule	1
displayBreadcrumb	1
displayAnnouncement	1
displayFooter	1
avatarPosition	left
formRecover	0
labels	0
whoisonlineName	default
avatarType	rounded
topicicontype	svg
fontawesome	0
socialshare	0
socialsharetag
socialtheme	classic
optional_username	0
writeaccess	0
localstorage	0
IconColor	inherit
IconColorNew	#48a348
editorType	ckeditor
Bold	1
Italic	1
Underline	1
Strike	1
Subscript	1
Superscript	1
RemoveFormat	1
BulletedList	1
NumberedList	1
Blockquote	1
JustifyLeft	1
JustifyCenter	1
JustifyRight	1
JustifyBlock	1
Link_Unlink	1
Image	1
Smiley	1
Confidential	1
Hidetext	1
Spoiler	1
Code	1
Ebay	1
Twitter	1
Instagram	1
Soundcloud	1
FontSize	1
TextColor	1
Maximize	1
Map	1
Video	1
editorButtons
nameskinckeditor
ckeditorcustomprefixconfigfile
avatarSizeX	40
avatarSizeY	90
avatarSizeXThumb	36
avatarSizeYThumb	36
avatarSizeXWelcome	72
avatarSizeYWelcome	72
avatarSizeXList	36
avatarSizeYList	36
avatarSizeXPost	144
avatarSizeYPost	144
avatarSizeXProfile	200
avatarSizeYProfile	200
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 6.0.2 | 2022-08-15 [ Git Repository ]
        | Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
boardOffline	0
enableRss	1
threadsPerPage	20
messagesPerPage	6
messagesPerPageSearch	15
showHistory	1
historyLimit	6
showNew	1
disableEmoticons	0
template	crypsis
showAnnouncement	1
avatarOnCategory	0
showChildCatIcon	1
rteWidth	450
rteHeight	300
enableForumJump	1
reportMsg	1
username	0
askEmail	0
showEmail	0
showUserStats	0
showKarma	0
userEdit	1
userEditTime	0
userEditTimeGrace	600
editMarkup	1
allowSubscriptions	1
subscriptionsChecked	1
allowFavorites	0
maxSig	300
regOnly	1
pubWrite	0
floodProtection	0
mailModerators	0
mailAdministrators	0
captcha	-1
mailFull	1
allowAvatarUpload	1
allowAvatarGallery	1
avatarQuality	75
avatarSize	2048
imageHeight	800
imageWidth	800
imageSize	400
fileTypes	txt,rtf,pdf,zip,,tgz,
fileSize	25000
showRanking	0
rankImages	0
userlistRows	30
userlistOnline	1
userlistAvatar	1
userlistPosts	1
userlistKarma	0
userlistEmail	0
userlistJoinDate	0
userlistLastVisitDate	1
userlistUserHits	0
latestCategory	0
showStats	0
showWhoIsOnline	1
showGenStats	0
showPopUserStats	0
popUserCount	5
showPopSubjectStats	0
popSubjectCount	5
showSpoilerTag	1
showVideoTag	1
showEbayTag	1
trimLongUrls	1
trimLongUrlsFront	40
trimLongUrlsBack	20
autoEmbedYoutube	1
autoEmbedEbay	1
ebayLanguageCode	en-us
sessionTimeOut	1800
highlightCode	0
rssType	topic
rssTimeLimit	1 week
rssLimit	100
rssIncludedCategories
rssExcludedCategories
rssSpecification	rss2.0
rssAllowHtml	1
rssAuthorFormat	name
rssAuthorInTitle	1
rssWordCount	0
rssOldTitles	1
rssCache	900
defaultPage	recent
defaultSort	asc
sef	1
showImgForGuest	1
showFileForGuest	1
pollNbOptions	4
pollAllowVoteOne	1
pollEnabled	0
popPollsCount	5
showPopPollStats	0
pollTimeBtVotes	00:15:00
pollNbVotesByUser	100
pollResultsUserslist	1
allowUserEditPoll	0
maxPersonalText	50
orderingSystem	mesid
postDateFormat	ago
postDateFormatHover	datetime
hideIp	1
imageTypes	jpg,jpeg,gif,png
checkMimeTypes	1
imageMimeTypes	image/jpeg,image/jpg,image/gif,image/png
imageQuality	50
thumbHeight	32
thumbWidth	32
hideUserProfileInfo	put_empty
boxGhostMessage	0
userDeleteMessage	0
latestCategoryIn	1
topicIcons	0
debug	0
catsAutoSubscribed	0
showBannedReason	0
showThankYou	0
showPopThankYouStats	0
popThanksCount	5
modSeeDeleted	0
bbcodeImgSecure	text
listCatShowModerators	0
lightbox	1
showListTime	720
showSessionType	0
showSessionStartTime	0
userlistAllowed	0
userlistCountUsers	1
enableThreadedLayouts	0
categorySubscriptions	post
topicSubscriptions	every
pubProfile	0
thankYouMax	10
emailRecipientCount	25
emailRecipientPrivacy	bcc
captchaPostLimit	0
imageUpload	registered
fileUpload	registered
topicLayout	flat
timeToCreatePage	1
showImgFilesManageProfile	1
holdNewUsersPosts	0
holdGuestPosts	0
attachmentLimit	8
pickupCategory	1
articleDisplay	intro
sendEmails	1
fallbackEnglish	1
cache	1
cacheTime	60
ipTracking	1
rssFeedBurnerUrl
autoLink	1
accessComponent	0
statsLinkAllowed	0
superAdminUserlist	0
attachmentProtection	0
categoryIcons	1
avatarCrop	0
userReport	1
searchTime	365
teaser	0
ebayLanguage	0
ebayCertId
allowChangeSubject	1
maxLinks	6
readOnly	0
ratingEnabled	0
urlSubjectTopic	0
logModeration	0
attachStart	0
attachEnd	14
attachmentUtf8	1
autoEmbedSoundcloud	1
emailHeader	media/kunena/email/
userStatus	1
signature	1
personal	1
social	1
plainEmail	0
moderatorPermDelete	0
avatarTypes	gif,jpeg,jpg,png
smartLinking	0
defaultAvatar
defaultAvatarSmall	s_
quickReply	1
avatarEdit	0
activeMenuItem
mainMenuId
homeId
indexId
moderatorsId
topicListId
miscId
profileId
searchId
custom_id
avatarType	1
sefRedirect	1
allowEditPoll	1
useSystemEmails	0
autoEmbedInstagram	1
disableRe	0
email_sender_name	GBC Forum Moderator
display_filename_attachment	0
new_users_prevent_post_url_images	0
minimal_user_posts_add_url_image	10
utmSource	0
emailHeaderSizeY	560
emailHeaderSizeX	560
moderator_id
profiler	0
pickup_category	1
emailHeadersizey	560
emailHeadersizex	560
board_title	Grey Blue Circle Forum
board_offline	0
offline_message	Het Forum is offline voor onderhoud. Probeer later opnieuw!
enablerss	1
threads_per_page	20
messages_per_page	10
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
showannouncement	1
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
askemail	0
showemail	0
showuserstats	0
showkarma	0
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	0
maxsubject	50
maxsig	300
regonly	1
pubwrite	0
floodprotection	0
mailmod	1
mailadmin	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2048
imageheight	800
imagewidth	800
imagesize	400
filetypes	txt,rtf,pdf,zip,,tgz,
filesize	25000
showranking	0
rankimages	0
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	0
userlist_lastvisitdate	1
userlist_userhits	0
latestcategory	0
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	0
popusercount	5
showpopsubjectstats	0
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	0
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
allow_user_edit_poll	0
maxpersotext	50
ordering_system	replyid
post_dateformat	datetime
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	0
catsautosubscribed	0
showbannedreason	0
showthankyou	0
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	0
show_list_time	720
show_session_type	0
show_session_starttime	0
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	0
thankyou_max	10
email_recipient_count	50
email_recipient_privacy	bcc
email_visible_address	forummoderator@
captcha_post_limit	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	8
article_display	intro
send_emails	1
fallback_english	1
cache_time	60
ebay_affiliate_id	5337089937
iptracking	1
rss_feedburner_url
autolink	1
access_component	0
statslink_allowed	0
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	1
searchtime	365
ebay_language	0
ebay_api_key
ebay_cert_id
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	1
max_links	6
read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	0
attach_start	0
attach_end	14
google_map_api_key
attachment_utf8	1
autoembedsoundcloud	1
emailheader	media/kunena/email/
user_status	1
plain_email	0
moderator_permdelete	0
avatartypes	gif, jpeg, jpg, png
smartlinking	0
defaultavatar
defaultavatarsmall	s_
stopforumspam_key
quickreply	1
avataredit	0
activemenuitem
mainmenu_id
home_id
index_id
moderators_id
topiclist_id
misc_id
profile_id
search_id
avatar_type	1
sef_redirect	1
allow_edit_poll	1
use_system_emails	0
autoembedinstagram	1
disable_re	0
recaptcha_publickey
recaptcha_privatekey
recaptcha_theme	white
keywords	0
userkeywords	0
userlist_name	1
usernamechange	0
version_check	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Disabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Enabled:  access=1  login=1  activity=1  avatar=1  profile=1  private=1  
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=1  
 Kunena - Kunena Enabled:  avatar=1  profile=1  

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
nl-NL	Dutch (nl-NL)
en-GB	English (United Kingdom)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None

I have the same problem as this German user, posted today: %C3%BCbersicht-kategorie-abonnieren-w%C3%A4hlt#225195

He reports that the problem has been solved by checking or adjusting the SEO settings?