Migrated user - now can't SEND AS user they used to be able to

User has access to own mailbox and additional email. Call it mailbox A.

User has profile set up to access mailbox A as main mailbox. They have full access and send as permission to mailbox A.
This worked fine beforee both mailbozes were migrated today.

Now user can access mailbox A but gets an error when trying to send as mailbox A. Checked permissions and they still have full access and send as permissions. I've even removed and re-added.

Still the same. Is it something to do with the way 2013 interprets permissions?
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paulfoelAsked:
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FOXActive Directory/Exchange EngineerCommented:
reset with the below command

Add-ADPermission -Identity mailboxA -User username -ExtendedRights "Send As"

ref link:https://technet.microsoft.com/en-us/library/jj919240%28v=exchg.150%29.aspx
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