When viewing the mailbox status in the Migration Manager for Exchange Console. The status never changes from "Switching" to "Switched" or "In Progress". There is also no option to manually switch the mailbox or unswitch the mailbox.
A review the MAgE (Migration Agent for Exchange) log will show the following message for the mailbox in question.
Info Cannot change the mailbox stage from 'Switching' to 'InProgress'.
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