We need to use Get-CsOnlineApplicationInstance for one of our unattended scripts. Many of our customers have asked us to move from user based authentication to application authentication. However, Ge...
For those interested, this has now been almost completely implemented. With the exception of Set-CsOnlineApplicationInstance, this can now be done using Teams Application Authentication:
https://learn.microsoft.com/en-us/microsoftteams/teams-powershell-application-authentication#cmdlets-supported
Get-CsOnlineApplicationInstance, New-CsOnlineApplicationInstance, and Sync-CsOnlineApplicationInstance are now supported (unsupported only in GCC High and DoD environments).