I am having the same problem. I am able to do only the lightweight migration without the error.
guciox
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I have the same problem, apparently there is a bug and the custom migration doesn't work if you are using CloudKit. I have the same situation and i am going to try lightweight migration and hope it will get fixed soon.
I wasn't missing anything. After my post on the forum suddenly I was able to enroll without any changes.
Thank you!
I fulfill all the requirements.
And I believe that Apple Support should be able to tell me if there is anything missing.
But after your response everything started to working and I was able to enroll. Thank You very much for help.