I've been playing with DEP and a teacher ipad with an icloud backup. I could not get the backup to restore and have the ipad in DEP so I gave up on that thought and went to restore it and reenroll manually though the jss enroll site, but now I continue to get the above message. I have wiped this ipad at least 7 times, it has no current profiles installed and now I cannot get it back onto management no matter what I do.
The teacher does require the backup to continue with her work.
Princeton Public Schools
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First and foremost, are you using the DEP to try and supervise the iPad?
Apple actually has an intended fail safe -- If a backup is created on an unsupervised iPad, if that iPad become supervised by any means (in this case the DEP/Pre-stage enrollment), restoring the backup to the same iPad it will remove the supervision. When you restore the backup to the same iPad, we've seen no sign that it registers the Pre-stage enrollment. Again, this is an intended "feature" by Apple due apparently to some litigation.
The error you're seeing may be a result of a pre-stage enrollment and the fact that the iPad would be unsupervised when the teacher's backup is restored. I would try removing the iPad from the pre-stage enrollment scope and then using the enrollment site to try and remove it (especially if you had checked the "Disallow MDM Profile removal button" in that pre-stage enrollment.