Maybe a chance for this spelunker badge as shown in the ‘first notification’ I got when signing up.
The documentation says you can assign multiple people to an issue. The interface does not allow it. I searched the forums, and all the issues listed from the search box do not have answers. Going on 3 years.
I have the same issue here. Have premium edition and can assign multiple users to a project if it is my private project. In case I make it a group project I can only assign one user. I am owner of the group though.
Is it a bug or am I not able to understand this feature?