I've tried to implement RMS server and enable IRM on SharePoint to connect to this RMS. However, after enable IRM for a document library, I tested by uploading some documents and it turned out that nobody, even the document author , has permission to view it. I tried to turn on User Profile and make it synced, however there problem persists.
The problem seems to come from SharePoint as I already test RMS server with Microsoft Office only and it still can restrict users normally without the same issue as in SharePoint
Please support
Error message
Document library
IRM setting