Greetings!  We are in the process of doing some testing and migration in a hybrid deployment with Office365 and Exchange on premise.

I just completed a migration for an on-premise user.  We have, so far, migrated 3 users in the IT department as initial testing.  The first two migrations were very cut and dry.  The third migration; as soon as I finalized the batch, multiple people on our team received messages about having to restart Outlook.  These were users that had not been migrated and were not part of any migration batch, but were members of the same department.  I am trying to understand, under what circumstance could a migration of a user cause other users who are still on premise to receive the "admin made changes" prompt in Outlook.

Thanks in advance.

Hi Joe,

Could you share the migration batch? Note, please hide if there are any sensitive information like domain name and server name.

Thanks,

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Do the users who received the prompt have permissions to access the mailbox which caused the change prompt?

I discovered the other users who got the prompt had access to this person's calendar and surmised it must be related.  Good thing to know going forward with future mailbox moves.