Occasionally, you will reach your device cap when entra joining devices. There are TWO places to check this- intune.microsoft.com and entra.microsoft.com.
Intune will tell you device limit per user is 5 by default, and you can modify it to 15. theres also options for DEM accounts. I tried with no success.
The alternative- Entra settings allow you to change the device cap to unlimited. Yeehaw
Use Entra