@Brandon S, Thanks for posting in Q&A. The message "Managed by mmdprov" that you see during the enrollment process may occur when the device is being managed by a different device management provider (not Intune). Please contact with your IT to unenroll the device in other MDM.
Once the enrollment process is complete, this message disappears since your device can now be managed by Intune. Please check if there's info button under the account in Access work or school and if the device is in Intune portal to confirm the enrollment complete.
Hope the above information can help.
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