We just upgraded the with new iMac Pros and installed Adobe CS 2020 on all the computer over the weekend.

When they open up InDesign documents there is a major issue and it is consistent.

When the first user opens a document from the server - they can work on the document edit make changes and save it back to the server no issues

When another user open the same document next they also can work on the document edit make changes and save it back to the server no issues

When the 3rd user  opens the document it opens as a READ ONLY document and after that anyone who opens the document has the same issue.

The problem is consistent and can be duplicated.

We checked all the permission on the server and they are set right.

The server is Mac OS Siera - the workstation are iMac Pro with Mojave

 I even had Adobe Support connect and gave access to the computer and they could not figure it.