Yep, I have the same problem. I can't call my Google Voice number (which uses an Obi200) from my Xfinity Mobile cell (which I think uses Verizon). I get the "calling restrictions" message.
There is a thread on the GoogleVoice forum at reddit - several people are having problems.
Go to
https://status.bandwidth.com/ for status. Google Voice uses
bandwidth.com to provide the service, and the current status shows lots of service disruptions today.
The good news for me is that all the robocalls from India seem to be getting through