Updated 10/25/22: Intune released a fix which has completely rolled out to the entire Intune environment by September 18 (completed and devices are remediating); and with Apple's recent release of iOS/iPadOS 16.1, we've confirmed that their fix is in to fully resolve this issue.
As highlighted in the Microsoft simplifies Endpoint Manager enrollment for Apple updates - Microsoft Tech Community post, we’ve been preparing for the iOS 16/iPadOS 16 by testing each beta release. We recently discovered an issue in Apple’s User Enrollment process. Both Intune and Apple are working on updates, but in the interim, if you enroll devices with User Enrollment you’ll want to understand the background and options as iOS/iPadOS 16 releases.
Impacted devices are:
If we believe you have devices that meet the criteria above, we also posted Service Health Dashboard post IT428176 under your Service Health dashboard. It's closed now because Intune's changes are complete and have confirmed that Apple's release of iOS/iPadOS 16.1 resolves this issue.
The user experience:
Update from 9/16:
Immediate mitigation:
A device can be un-enrolled and re-enrolled which will apply a new management profile and the new OS. (We've deployed a mitigation fix in the 2209 Intune service release where you no longer need to take this step.)
Resolution:
With both fixes deployed, users will not receive the update error and can easily update to iOS 16/iPadOS 16 and higher.
Blog post updated
We will keep this post updated as we have additional information and as fixes are released. If you have questions, reply to this post or reach out to @IntuneSuppTeam on Twitter.