Make a call from Gmail on your PC. Log in to www.gmail.com using a computer web browser. On the left side find "Call phone" and make a call using that. Should fix the issue. Also make sure to dial with an area code when using GrooVe IP.
See line two of my post I called using gmail.com and it works tried again with GrooveIP no workie
I always use 10 digits to dial because there are like a half a dozen area codes near me.
Too the numbers I try to call a local to where I live but not really local to my GV number , same area code, but the exchange is like 40 miles away. i.e. where I live is 972-town where I live-####, my GV number 972-another town 40 miles away-####