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First make sure you have the correct mailbox identity or account id:

Get-Mailbox -Identity [account id] | Format-List RecipientTypeDetail

you can also use this command to verify the change request completed successfully after using the Set-Mailbox command below. The following PowerShell command will change or convert a mailbox to shared

Set-Mailbox -Identity [account id] -Type Shared

You can also convert accounts to and from other types like room or equipment mail boxes

Set-Mailbox -Identity [account id] -Type [Regular | Room | Equipment | Shared]