@Cutts, Matthew, Thanks for posting in Q&A.
From your description, I know you are in trouble Windows 11 upgrade using Intune.
To clarify this issue, here is some information you can refer to.
1.Follow the link below to troubleshoot update rings policy.
2.Follow the link below to troubleshoot feature update policy.
https://www.anoopcnair.com/windows-feature-update-failures-intune-report/
Non-official, just for reference.
3.Try to unassign the device or user group from both of the policies, wait for a few minutes and re-assign it and sync with Intune to see if you can get the update.
Please check above information, if there is any update, feel free to let me know.
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