Not able to log into the forum from my iPad or iPhone

I am obviously a total noob. When I try to log into this forum from my iPad (Safari or Edge), I get a page for a login creation. Even if I plug in the correct email address and password, nothing happens. What’s with that?
Many thanks for any help

Anyone else having the same issue? I just tested it on my iPad and it worked fine.

Is this a VPN issue. On my iPhone (no VPN) I can log in just fine. On my iPad (VPN) I cannot. I get the same screen as if I had to create a new login.

I believe this was a DNS issue. I changed my DNS settings and now I can log in also from my iPad.