The Ready State Virtual Mobility Coach is like having a virtual Kelly Starrett in your pocket.
Yes, i also had the same issue twice. Someone of technical support – e.g. Dave – has to reactivate your account, because your IP address changed too many times for a period of one month or similar. It is a kind of security restriction.
Contact -> Report Technical problem
You can also try to use only your home WLAN connection to avoid the problem when you also use your mobile phone for mobilitywod.