Using the MicrosoftTeams PowerShell module V5.5, this still works:

$Domain = “orange.fr”
Set-CsTenantFederationConfiguration -AllowedDomainsAsAList @{Add=$Domain}

The documentation https://learn.microsoft.com/en-us/powershell/module/skype/set-cstenantfederationconfiguration?view=skype-ps also confirms that the cmdlet still works as used in the script.

The point is that the script calculates domains from guest user accounts and updates the external configuration with those domains (one at a time). I could build a list object and commit them all together… maybe I’ll do that one day.

Regards.
Clément BONNIN

Thanks so much for your script ! It helps a lot !
Unfortunaltely, I had to modify it a little to make it work.
As I’m working on multiple tenants, it’s better for me to add disconnects before MgGraph and MicrosoftTeams

But the main issue seems to be with “Set-CsTenantFederationConfiguration -AllowedDomainsAsAList”.
If I well understand, AllowedDomainsAsAList was only working with the old SkypeForBusiness PS module.

With some help :
https://learn.microsoft.com/en-us/answers/questions/1160191/whitelist-a-domain-for-teams-online-in-a-federated

I replaced it with “Set-CsTenantFederationConfiguration -AllowedDomains” and some other lines.

Thanks again,

Regards.

Clément BONNIN