Check the event viewer for detailed error massages.
Remember that EMM have default policy that only allow encrypted devices. If i remember correct.
Disable "Block devices that does not support encryption" and try again.
Most of my Android devices does not support DAR.
Older versions of EMM (EMM 9.6) had an issue of classify all android devices as Jailbroken because this information of the Android where N/A, not YES or NO.
You are right! Now my devices appear in EMM.
Thank you very much for your help!