Can't create a remote admin

I’ve been trying for hours.
My ports 80 and 443 are open and operating for my rasperry ip, I’ve checked many times and even contacted my internet provider to confirm that they are not blocked.
In the field “domain or IP address” I place my public ip, (have tried with the https:// also) and then my user and password.
When I only insert my ip, this appear:

Error: Error: remote host add: write() argument must be str, not None

And when I inster https://(my ip)/ The page just reload and nothing happens.
What could be the problem?

Please see this issue: