Hi,
Log back into
www.obitalk.com site:
Click OBi Dashboard
Click SP1
Click link "Click Here to replace the active Google Account"
And follow all steps to authenticate to your business Google Voice account.
Once "Connected", please make your test calls in/out
Side Note: You can have one single Google Voice (Business account) added to both OBi devices at different location and incoming calls will ring both OBi devices.
Best Regards,
SupTeamGuy