Cannot login to zero trust

I am on iOS, latest version attempting to login 1.1.1.1 And Cloudflare one, I cannot login, it is giving me the error Enrollment request is invalid
I have the Cloudflare certificate installed on my device

Sounds a lot like this:

Could you try what I outlined on that comment?

How this would be related to email problems? Mentioned message “Enrollment request is invalid” occurs before any login action can happen - just after entering ‘Organization Name’ and clicking ‘Next’.
Nevertheless I added GitHub SSO and nothing changed