If it is using OAuth2 then it could be that Google (like others) are starting to block embedded browsers due to security issues.
If that is the cause, you can refer to this recent forum thread where I mention some possible solutions:
If it is using OAuth2 then it could be that Google (like others) are starting to block embedded browsers due to security issues.
If that is the cause, you can refer to this recent forum thread where I mention some possible solutions: