Problems with OnlyOffice

I installed the Comunity Document Server and OnlyOffice in NC 20.0.5 an tried to edit an uploaded Excel sheet. It works when I use a browser (Firefox, Chrome) on my Linux Systems but it does not work when I try it with the same browser on a Windows or Android system. A friend tries it with Safari an it works too.
The following happens: If I click at the document, OnlyOffice begins to start and then appears a message like “connection refused from” or “This page has a content security policy that prevents it form being loaded in this way”. I don’t have any idea why it works with a Linux and Apple user and not with a Windows user.
What can I do?

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