External Mail is not Working, internal Users are not working too

We have Nextcloud (29.0.11 Enterprise)
A)
In the description of the Teams app it says that you can also integrate external users via email. (See here: Essential hacks for better team management with Nextcloud Teams)

In general, this also works. You can enter the email. The email address is listed in the Teams app … but the external person never receives an email.
Is this a bug or is a setting missing somewhere?

B)

  1. i create another Teams group and add internal users.
  1. I create a chat room and add the Teams group
  1. the internal users cannot see/reach the chat room
    When the internal users click on the chat room in their Teams app under Team resources, they generally can no longer reach the Talk app. The following error message appears:
    Too many requests

Too many requests from your network. Try again later or contact your administrator if this is an error.

:scream:Damn,…this looks like bugs…Does anyone know the problem?

OK,…took a look at github. It’s still full of bugs.
So why all this marketing?

I also posted about this on Github. Please respond there if others have the same problem:
Circles (Teams) Invite external Users using mail is not working generally, internal users in Talk-App is not working · Issue #1864 · nextcloud/circles · GitHub