Active Roles Search not working - Get-Mailbox is not present

Hello,

when searching in Active Roles i do get the following error:

PowerShell script errors: cmdlet Get-Mailbox is not present in the role definition of the current user, script: Get-Mailbox -RecipientTypeDetails SharedMailbox -Filter 'DisplayName -Like "???*"'

Can you tell me what is wrong here? EXO Management Shell is installed and consent to tenant is set.

Thanks in advance.

Michael