Forbidden [403] when syncing calendars

OGCS Version: v2.8.1-alpha (same issue occurs with v2.8.0-beta) Installed or Portable: Portable (installed has same issue)

Problem Description
When syncing a google calendar to Outlook calendar (bi-directional with defaults applied), the following error is encountered:

2019-09-08 02:13:11,885 DEBUG  30 OutlookGoogleCalendarSync.GoogleOgcs.Calendar [0] -  Processing >> 8/20/2019 9:30 AM (R) => "<redacted subject>"
2019-09-08 02:13:11,886 DEBUG  30 OutlookGoogleCalendarSync.Recurrence [0] -  Creating Google iCalendar definition for recurring event.
2019-09-08 02:13:11,896 DEBUG  30 OutlookGoogleCalendarSync.Recurrence [0] -  RRULE:FREQ=WEEKLY;BYDAY=TU,TH;UNTIL=20190917T093000Z
2019-09-08 02:13:11,910 DEBUG  30 OutlookGoogleCalendarSync.Console [0] -  8/20/2019 9:30 AM   "<redacted subject>"
2019-09-08 02:13:11,910 DEBUG  30 OutlookGoogleCalendarSync.Console [0] -  AttributeChangeRecurrenceRRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20190917;BYDAY=... → RRULE:FREQ=WEEKLY;BYDAY=TU,TH;UNTIL=20190917T09...RecurrenceRRULE:FREQ=WEEKLY;WKST=SU;UNTIL=20190917;BYDAY=... → RRULE:FREQ=WEEKLY;BYDAY=TU,TH;UNTIL=20190917T09...Descriptionhttps//<redacted url> →   <redacted url>  Reminder DefaultTrue → False
2019-09-08 02:13:11,942 DEBUG  30 OutlookGoogleCalendarSync.Console [0] -  4 attributes updated.
2019-09-08 02:13:12,196 DEBUG  30 OutlookGoogleCalendarSync.GoogleOgcs.Calendar [0] -  Saving timestamp when OGCS updated event.
2019-09-08 02:13:12,381 WARN  30 OutlookGoogleCalendarSync.GoogleOgcs.Calendar [0] -  Google.Apis.Requests.RequestError
Forbidden [403]
Errors [
	Message[Forbidden] Location[ - ] Reason[forbidden] Domain[global]
]

2019-09-08 02:13:12,382 ERROR  30 OutlookGoogleCalendarSync.Console [0] -  Updated event failed to save.
2019-09-08 02:13:12,422 DEBUG  30 OutlookGoogleCalendarSync.Forms.ErrorReporting [0] -  Asking user if they want to automatically report errors.

Steps to Reproduce the Issue

1. Create new calendar in outlook (Add Calendar->Create New Blank Calendar)
2. Download and extract latest v2.8.1-alpha
3. Run exe
4. Configure Settings
   • Outlook - All defaults except picking new calendar in “Select Calendar”
   • Google - Retrieve, auth & select calendar
5. Sync Options
   • All defaults except setting Bi-Directional for Direction
6. Start Sync - Successful!
7. Wait a few mins
8. Start Sync - Failed with error above
9. Error dialog appears
10. Click OK
11. Application hangs and must be killed

Any other information

• Outlook account is an @msn.com account
• Google account is a GSuite account
• Occurs in v2.8.0-beta (installed) & v.2.8.1-alpha (portable)
• Full Log submitted via dialog and also directly
• Attempted multiple times starting the above process from scratch and same result each time
• No changes were made to the calendar items on either side during the interval between step 5 & 7.

[kwagner115]

This guy Paul is GOOD!!! 😃

[phw198]

@jondavis9898 Nice - all looks in order.