@rdicosmo , you should be able to login with the usual credentials using that URL: https://archive.softwareheritage.org/admin/login/

Otherwise, I invite you to register an account to our authentication service by following that link.
Once it is done, I will set permissions for you to access the admin part of the webapp when logging through the Login link at the top right of each page.

thanks, done!

@rdicosmo , I just added you to the staff group. You should be able to access the admin parts of the webapp by logging out and logging in again.

It'd be useful to have a post-mortem on this, to make sure it doesn't happen again in the future.
Why wasn't @rdicosmo able to login? What has changed? The login URL? (if so, is the old URL still linked from anywhere?) Or were the old credentials temporarily unavailable? etc.

Why wasn't @rdicosmo able to login?

Login through Keycloak uses a different Django authentication backend and thus a different set of users and credentials.

What has changed? The login URL? (if so, is the old URL still linked from anywhere?)

Yes the login URL changed and the old one is not linked anymore. Nevertheless, I kept it alive in order to have a fallback
for admin login in case Keycloak authentication service gets down somehow.

Or were the old credentials temporarily unavailable? etc.

They are stll available for the default Django authentication backend.