Powershell Error - Set-Mailbox, a parameter cannot be found that matches AuditOwner

Question

I'm testing some auditing in my dev tenant trying to set up the "SearchQueryInitiated" abilities from here...

Get started with auditing solutions | Microsoft Learn

Based on the above link I've tried to turn on the auditing for my global admin, AND I'm running it as global admin.

 Set-Mailbox "[email protected]" -AuditOwner @{Add="SearchQueryInitiated"}

But it gives me the error "Set-Mailbox : A parameter cannot be found that matches parameter name 'AuditOwner'." I tried variations of it -

 Set-Mailbox -Identity "[email protected]" -AuditOwner @{Add="SearchQueryInitiated"}

with the same error, I tried it in both powershell 7 and powershell 5.

And my Dev Tenant does have the Advanced Auditing Enabled.

I'd appreciate any suggestions, it's super frustrating - thanks!!