Description of the bug

Opening any .docx document leads to onlyoffice error:

The document security token is not correctly formed.
Please contact your Document Server Administrator.

Step by step instructions to reproduce the bug

It literally doesn't work on live demo

Can you replicate that error from the demo?

Yep

Observed behavior

Onlyoffice error:

The document security token is not correctly formed.
Please contact your Document Server Administrator.

Expected behavior

No error