The ability to see the PowerShell commands executed by Exchange administrative centers has existed since Exchange 2007. Now something has changed in Exchange Online and the command log is blank. It’s sad because many administrators learned to use PowerShell by examining how Microsoft used it to manage Exchange. Let’s hope that Microsoft fixes this bug soon.
https://office365itpros.com/2019/07/04/powershell-command-logging-broken-exo/
