Feb 08 2021
multiple 365 Groups created via Teams do have a different behavior. In Short older ones cant be integrated as a group in Outlook and no e-mails are send to the group mailbox.
If I create a new Team or 365 group everything works as intended.
The old groups are not hidden from exchange but I cant join them in outlook. If I try a message to the admin is requested but could not be sent. In my opinion because I had allready joined.
Both type of groups are configured exactly the same via the Exchange Admin Center.
The problem seems to be that the old groups are not connected to E-Mail App. But I cant find any setting or solution to correct this.