Calendar sync issue (Google Calendar and Outlook)

Troubleshooting 4 min read Updated: September 8, 2026

If calendar sync stops working or events are missing, these steps help you restore it — for both Google Calendar and Microsoft Outlook.

Google Calendar sync is usually reliable, but it can stop working after Google access is revoked or when the integration enters a sync error state.

Symptoms

New bookings do not appear in Google Calendar
Busy times from a connected staff Google Calendar no longer block availability in Bokko
The integration shows Sync error or Access revoked - reconnect required

Fix: check the integration state first

Go to Integrations and open the Google Calendar section. Also check the affected staff member's calendar section if the problem is tied to one person.
If the state is Sync error, try Re-sync first.
If the state is Access revoked - reconnect required, use Reconnect and approve Google access again.
If you still want a clean restart, you can disconnect and then connect again.
After the connection is healthy again, upcoming bookings can sync normally.

InfoReconnect and re-sync are not the same. Re-sync retries upcoming bookings on the existing connection, while reconnect creates a new authorized connection.

Microsoft Outlook specific errors

Outlook sync is staff-level, so the error message appears in that colleague’s own calendar section.

Message	What it means and what to do
Your organization’s administrator may restrict calendar access.	An administrator in the company Microsoft 365 tenant has blocked calendar access for applications. Ask IT to allow it, or connect a personal Microsoft account instead (Outlook.com, Hotmail, Live).
Microsoft calendar access is incomplete. Reconnect with full access granted.	Not every requested permission was granted during connection. Reconnect and leave all access checked on the Microsoft screen.
Microsoft access was revoked.	The colleague (or an administrator) revoked Bokko’s access. Reconnect.
The Microsoft subscription expired.	The calendar watch expired and needs renewing. Reconnect the calendar.
Microsoft API error.	A temporary problem on the Microsoft side. Wait and retry; if it persists, check the system status.

If reconnecting does not help

Check status.bokko.io. If there is an incident in the integrations section, the cause is system-wide.
If there is no incident, email support@bokko.app and include the connected Google account address or addresses involved.

Frequently asked questions

Do previously synced events disappear from Google Calendar if I disconnect?

Will reconnecting sync my past bookings retroactively?

What is the difference between Re-sync and Reconnect?

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