Previous mcs was authenticating all the users agains <empty> region,
this was a problem when an admin configure a different region via the
configuration page on mcs, now before authenticating a user via
credentials or idp mcs will ask minio what's the current region and try
to authenticate using that that information.
- Login to mcs
- Go to the configuration page and change the region, ie: us-west-1
- Logout from mcs
- Login to mcs again, you should not get any error