@Marra,Thanks for posting in Q&A.
For your issue, could you please confirm us what kind of iOS enrollment type you are using? I have done some research, here are some potential reasons.
1.There's a temporary outage with Apple services.
2.iOS/iPadOS enrollment is set to use VPP tokens but there's something wrong with the VPP token.
3.The iPad version may not support Intune enrollment.
Here are some solutions you can refer to fix this issue.
1.Check whether the device meet the Intune enrollment requirements.
2.Determine if there's something wrong with the VPP token and fix it.
3.Wipe the affected devices.
4.Restart the enrollment process.
5.Check whether the network works properly.
6.Try to delete the enrollment profile and create a new enrollment profile to re-enroll.
https://learn.microsoft.com/en-us/troubleshoot/mem/intune/device-enrollment/device-stuck-in-enrollment
If there is any unclear, feel free to contact me.
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