Hi Atlassian Community 
I an the admin in a Jira project and I recently edited the permissions for a project so that 'Assignable User' permission is also granted for a certain group.
I tried to change the assignee on an open issue we have, this user is in the group which I granted the permissions to. When I chose his name from the drop-down menu and clicked to approve, I received the message "User 'XXXX' cannot be assigned issues." (XXXX stands for the user name, it is not the original message)
Does anyone knows why this happens? Should I change any other settings?