A cloud-based service included in Microsoft 365, delivering scalable messaging and collaboration features with simplified management and automatic updates.
What perms does the "admin" account have?
At a minimum the account needs to be in the MailRecipients role group
$Perms = Get-ManagementRole -Cmdlet Set-User -CmdletParameters RemotePowerShellEnabled
$Perms
Name RoleType
---- --------
Mail Recipients MailRecipients