Joining a team / group

[cheggerdev]

Describe your question/
I have the following scenario:

I have several groups each representing a team. Every team has a teamleader group as parent.
When someone signed up and wants to join a team he should be able to select the team.
Then one of the leaders (of the teamleader group) shall confirm (similar to email stage) to join the team.

I can do the sign up with standard user enrollment.
I can do team selection with a Dropdown-List in a prompt stage in the flow.
But how can I do the leader confirmation?

My guess is to do that with an expression policy, but how can I send a custom email similar to the email stage?

Version and Deployment (please complete the following information):

• authentik version: [2024.12.3 (yet)]
• Deployment: [docker-compose]