SAML single sign-on - Why can't I access the NVIDIA Gitlab Optical Flow SDK repo anymore?

So I requested invitation to the Optical Flow SDK repository and I was granted the access right away. After a few weeks, I can’t get there anymore seeing this:

Even when hitting authorize I get into an NVIDIA page but I probably don’t have any account there to be used for this. The only one available there says:
Selected user account does not exist in tenant ‘NVIDIA Corporation’ and cannot access the application in that tenant. The account needs to be added as an external user in the tenant first. Please use a different account.

What happened?

I have no solution, don’t know what happened but it started working again. Still would be nice if someone can explain what is this about.