Can you tell us what you are trying to do?
Add a Google Voice line?
Add a SIP line?
Etc?
First do a factory reset to be sure the device is clean.
System Management> Device Update> Reset Configuration.
Optional
Temporarily turn off the firewall in your modem / router if you know how.
Turn it back on when on when done.
Using Google Chrome in a single tab, without any ad blockers, etc go to www.obitalk,com
and try again.
Have your gmail account ready to get your new Google Voice number
That didn't work for me.
If you leave the "I want to configure Google Voice on this device." box checked
it may not work. It didn't for me earlier today.
Go to
voice.google.com and get your number using your gmail address
then login to obitalk with that gmail address and complete the configuration.