I've created a new project in Youtrack cloud.
The only available Users to be added to the Project's Assignee are root and guest.
I've tried to create new Users (both by invite and create account) and grant them roles to the project. But no luck. New users can't be added to the custom field bundle.
Is it a limitation of free version? A bug? A miss-configuration?
Btw, we are using Youtrack (licensed) in our company and there are no issues with this functionality.
Also, I've observed that there is no way to delete a User once it was created.