Show a pop-up with an error message if a user has already joined.
Show a pop-up with an error message if the invitation code is expired.
[ ] If the user is a non-logged-in or non-registered user, the user is redirected to the login page. After logging in, they are automatically redirected to the joining group page.
Description
Criteria
[ ] Error handling
[ ] If the user is a non-logged-in or non-registered user, the user is redirected to the login page. After logging in, they are automatically redirected to the joining group page.
Notes
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