Group coordinator cannot log-in

Usually the reason for the group / group coordinator not being able to log in that their 'Group Status' set to prevent from making changes to the registrations.

1. Go to Menu tab Maintenance and navigate to  Group Status.
2. Double click the group status to check it. 
3. Scroll down all the way to 'Allow login'
4. Check if it has been set to 'YES'.
5. Go to the View Groups screen.
6. Select a group who could not log in previously and test.
7. Voilà! Now all group coordinators with that status can log-in

NOTE! Groups must have a status. If they do not have a status at all, the system won't allow when to login.