Appointments Google Calendar error message Invalid Credentials

I followed steps. When I assigned email address created from API, the calendar would not accept Make Changes to Event. I would select from drop down but once it was created it would display see all event details.

I was able to make an appointment for 3:55. On the backend it showed the start time at 12:00am and ending at 4:15pm

I did grant WPMU access so you can see the appointment and our logs.

[July 13, 2015 3:31 pm] Error refreshing the OAuth2 token, message: '{
"error" : "invalid_grant"
}'
[July 13, 2015 3:31 pm] Error calling POST https://www.googleapis.com/calendar/v3/calendars/ezwaves.com_jghlc2kchebdio9vf4kkf3adc0@group.calendar.google.com/events: (401) Invalid Credentials
[July 13, 2015 3:31 pm] The insert did not create a real result we can work with