I have an on-premises Exchange 2013 [Version 15.0 (Build 847.32)] with an issue preventing me from migrating mailboxes between databases.
When I log into Exchange Admin Center it shows 6 Alerts from the drop down near the top right, which are previously queued mailbox migrations. If I click on "View Details" from the drop down it takes me to the "Migration" tab and says "There are no items to show in this view."
When I run the Exchange Management Shell command Get-MoveRequest | Remove-MoveRequest it prompted me to clear 4 move requests but at the top of EAC it still shows 6 queued migrations and any time I try to migrate it just gets queued.