Error accessing the web my.nextdns.io from iOS and Safari

Hello, for some time I have been having trouble accessing my.nextdns.io from iOS and Safari. I have tried from other browsers on iOS and it works. Things I have tried

• Clear cache.
• Disable extensions.

I currently have the iOS 17 beta installed but it also happened with iOS 16, 

I attach a screenshot of the error.

Thanks, 

Bye