Disabling google auth and having only SMS fails

In my test app, Initially I had enabled Google auth and later included passwordless SMS. Now unless I have google auth SMS passwordless loging is failing , and the log message shows - “error”: {
“message”: “Unknown error”,
“oauthError”: “Unknown error”,
“type”: “bad.connection”,
“uri”: null
NOTE: I have disabled google auth , its not showing in the UI. When phone number is entered and submit clicked it fails . (again) However with google auth enabled works fine