Licences for group call pickup

Hi Everbody,

I have a question about licencingf or group call pickup and call sharing.

We don`t want the delegation function because an Phone System with PSTN is needed.

 https://docs.microsoft.com/de-de/microsoftteams/shared-line-appearance

But for group call pickup only Enterprise Voice licences are needed and they are already granted to the specific users.

https://docs.microsoft.com/de-DE/microsoftteams/call-sharing-and-group-call-pickup?WT.mc_id=TeamsAdminCenterCSH

In the TeamsCallingPolicy "AllowCallGroups" are set to true, but I can`t set up group calls in the client. Do I overlook anything regarding the licenses or an configuration in the admin center?

Many thanks for your help