If this user's MS Account is the same one which be added in AAD, you don't need worry about the data.
Just connect organization with this AAD, and login with the previous MS Account(don't need to change anything) . The data still be obtain now.
does this mean that all the work items created on DevOps with
[email protected] will be left "orphan"?
This situation is only occurred on the MS account is not same with the account which be added in AAD. For this, if the user want to obtain and migrate the data from previous account. Need to contact our engineer here, and we will help user migrate data from backend.
Edit: May caused by my not clearly expression let it confusion.
In fact, for add MSA into AAD, it's normal for all user account to do this operation. The only one affection is the account which should be login to Org after connect AAD to Org.
Here has two account: [email protected](person account), [email protected](work account).
Scene: The account you used usually is [email protected].
(1)If add this account into AAD, you don't need to do anything like migrate data after connect the org with AAD. Just still login with this account is ok.
(2)If add another account([email protected]) into AAD, you need to finish the data migrate and identity transfer operation after connect org with AAD, if you want to retain the data history.
Note: these two does not belong to any AAD before add them into the new AAD you want to AAD. Or it will be a more complex operation. If you meet this, feel free to share it here, I can share the detailed process with you about this complex situation.