@Matt H Thanks for posting in our Q&A.
For this issue, we appreciate your help to try some actions:
1.Please try to use another admin account to sign in and check if it works.
2.Maybe this is a network issue, please try on another network or browser.
3.Based on my check, intune portal has a same page under Devices > Enrollment >Automatic Enrollment. Please try to check if you can add a group.
If there is anything update, feel free to let us know.
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