Some accounts may experience problems when listing their calendars through the "Edit Calendar" menu if they haven't accepted Google's terms of service yet.
As far as we can tell, there are two places you should check:
1. Log in as the booking account and then try to access your account setting or Google Calendar.
2. Visit the developer console https://console.developers.google.com
Once you accept the terms of service, refresh the Robin dashboard and you should be able to see your calendars.