Onlyoffice doesn't open file

hello i have an nextcloud 28.0.3 + only office 9 + Community Document Server
in my configuration i add https://mysite/nextcloud/index.php/apps/documentserver_community/
that worked last week
but now (without any update) file doesn’t open anymore …
when i edit onlyoffice option to save i have this error now
Client error: GET https://mysite/nextcloud/index.php/apps/documentserver_community/healthcheck resulted in a 404 Not Found response:
i don’t understand why that doesn’t works !
thanks for any help

Same as Onlyoffice no more working with nextcloud, duplicate.

not realy i am already in 9.1.2 and next cloud 28.0.4 and the message is same