Jamf Pro-Entra ID Registration successfull , but some Devices wont deliver Device ID to MS

Hey Nation,

we just started the Registration for our 250 Mac Devices to MS Endpoint Manager.
Registration went successfully, I can see the Devices Compliant in Endpoint Manager.

We just have 2 issues:

1. most of our Users Sign In to MS Services, but it won't deliver a Device ID. Others do...

 2. Some Users daily get the prompt for the Registration again (JAMFAAD). I understand JPRO and
        Endpoint Manager proof of the integrity of the registration, and the activity of the device. But, every                 Day seems a bit too much, I guess (?)


Thanks for some ideas!