Direct access to login screen > Unknown error

As a user, I go directly to https://satosa.didmos.latest.crust.tech/didmos/discovery/ because I want to access self-service screen

**Actual result:**
I get to the login screen. When I insert the correct credantials, I receive an error screen saying 'Unknown error'.

Error in the console:
Failed to load resource: the server responded with a status of 500 ()

**Expected result:**
If the login doesn't work, we should redirect users to the URL where we configure the correct URL (instead of showing them the login page and give the impression everything works fine).

This problem can appear when users will bookmark this url to access login directly.

**Steps to reproduce:**

1. open https://satosa.didmos.latest.crust.tech/didmos/discovery/ in incognito tab
2. login with the correct credantials