Been trying to set up DDNS using one of the BT supported DDNS providers (changeip.com). Set everything up but hub refused to update DDNS and the status would only say error.
Checked all credentials and looked in the log (nothng to see there).
Then overnight I had an idea, I use a password generator for strong passwords and it included special characters (as reccomended) which is what I was using. Regenerated my changeip password without using these and lo and behold it now all works. 😀
So somehow or other the hub is not handling (some?) special characters in passwords properly.
Not the first time I have experienced BT screwing up passwords, at one time the MyBT web page where you set a password wasn't case sensitive but the page you logged in on was (or vica versa) meaning the password you had set wasn't accepted when you tried to use it. 🤔