I spent a few weeks try to find out how to complete device enrollment from no ad to aad as part of 365 business. There was no way to retain the local user settings by switching login to use 365 credentials and no way other than 3rd party tools like pcmover. This felt like a huge gap. I enquired via multiple tickets with ms support over a few weeks.
Then, I found the answer
Ms is giving free versions free version of Laplink profile mover until June