EXCHANGE   Remove Exchange database: “The mailbox database contains one or more mailboxes…”

We have moved all the mailboxes from database "PRUEBA21" to another one because we want to delete it

This powershell with no results confirms there are no mailboxes left on that database:

[PS] D:\>Get-Mailbox -Database PRUEBA21
[PS] D:\>

Now, we delete the database on the EMC or via powershell but a warning appears:

Exchange remove database error

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