Converter url: document signature in OnlyOffice Groups

I installed community edition of OO Docs and OO Group on separate servers with Debian 12(not Docker).

Both of them works good spearately but documents from OO Groups can only be downloaded instead of opening in OO Docs to edit.
Configuring OO Groups: Integration → Document service and setting proper IP addresses I see “Converter url: document signature”

Hello @marcin
Please reproduce the issue ( “Converter url: document signature” pop-up message on the Save button) and provide us with Document server logs folder. It’s located here:
docker: /app/onlyoffice/DocumentServer/logs/documentserver/
deb\rpm: /var/log/onlyoffice/documentserver/
Additionally, please make a screenshot of your settings on the Document Service page on the Groups side.