Which direction is broken?
Both directions run through Settings → Calendars at https://cal.id/settings/my-account/calendars. That page is where you will spend most of this article.
”Check for conflicts” and “add events to” are different settings
Getting these two confused is the single most common cause of calendar-sync confusion, so it is worth being precise about them before anything else.
A worked example. You keep three Google sub-calendars: Work, Personal, and a subscribed Holidays feed.
- Tick Work and Personal for conflicts, leave Holidays unticked — your own commitments block bookings, but public holidays you do not observe do not.
- Set Add events to calendar to Work — every booking lands in one predictable place.
- A dentist appointment on Personal still removes the slot, even though no booking will ever be written there.
Bookings are not appearing on your calendar
The booking exists in Cal ID — you can see it under Bookings — but nothing arrived on the calendar itself.The booking is still awaiting confirmation
The booking is still awaiting confirmation
An event type with Requires confirmation turned on creates a pending booking. Cal ID does not write a pending booking to your calendar, because you have not accepted it yet.Go to Bookings at https://cal.id/bookings and open the Unconfirmed tab. Accept the meeting and the calendar event is created immediately.Related: Require booking confirmation
No destination calendar is set
No destination calendar is set
If no calendar is connected — or the event type points at a connection that has since been removed — Cal ID has nowhere to write.
- Go to Settings → Calendars at https://cal.id/settings/my-account/calendars and confirm a destination calendar is selected.
- Open the event type, go to the Advanced tab, and check the Add events to calendar dropdown. An event type can override the account default here, and duplicated event types carry the override with them.
You are looking at the wrong sub-calendar
You are looking at the wrong sub-calendar
In Google Calendar and in the Unified Calendar, each sub-calendar has a visibility tick box in the left sidebar. If the destination calendar is toggled off, its events are on your account but invisible in the view you are looking at.Toggle every calendar on in the sidebar and look again before assuming the event was never created.
The write silently failed on an expired connection
The write silently failed on an expired connection
A connection whose token has expired can still appear in the list while failing every write. Bookings pile up in Cal ID and none of them lands.Work through The connection is broken or its permission was revoked below, then create a test booking on a spare slot to confirm writes are flowing again.
Outside events are not blocking your availability
Something is on your calendar, but Cal ID offered the slot anyway and you got double-booked.1
Confirm the event is marked Busy
An event set to Free — the default for many all-day events, birthdays, and subscribed feeds — is deliberately ignored. Change it to Busy on the calendar itself.
2
Confirm the event's sub-calendar is checked for conflicts
Go to Settings → Calendars at https://cal.id/settings/my-account/calendars and expand the connection. Each sub-calendar has its own tick box, and a conflict on an unticked sub-calendar is invisible to Cal ID.
Newly created sub-calendars are not ticked automatically. If you made a new “Client work” calendar last week and it has not blocked anything since, this is why.
3
Check that you declined nothing
An invitation you declined is generally not treated as busy time. If you intend to attend, accept the invitation or add a separate blocking event.
4
Check how far ahead the sync reaches
Cal ID pulls in your meetings from the past 30 days and the next 90 days. A conflict far outside that window may not be reflected in the Unified Calendar view even though it exists on the source calendar.
5
Verify with the troubleshooter
Open https://cal.id/availability/troubleshoot and select the date. If the event does not appear as a busy block there, Cal ID genuinely cannot see it — the cause is one of the four steps above, not a booking-page problem.
Bookings are landing on the wrong calendar
Cal ID writes each booking to exactly one calendar, chosen in this order of precedence:- The Add events to calendar value on the event type’s Advanced tab, if one is set.
- Otherwise, the destination calendar set in Settings → Calendars.
Changing this setting affects new bookings only. Meetings already on the wrong calendar stay where they are — move them by hand on the calendar, or cancel and rebook if attendees need a fresh invitation.
The same booking appears twice
The same calendar is connected twice
The same calendar is connected twice
Reconnecting a calendar without removing the old connection can leave two live connections to the same account. Both write, so every booking is created twice.Go to Settings → Calendars, look for two entries with the same email address, and remove the one you do not want. Delete the duplicate calendar events by hand afterwards — removing a connection does not clean up events it already created.
You are both the host and an attendee
You are both the host and an attendee
If your own email address was added to a booking through the Add guests field, you receive the invitation as a guest and Cal ID creates the host event. Two entries, one meeting.Remove your own address from the guest list when booking. This most often happens while testing your own booking link.
A third-party sync tool is also copying the event
A third-party sync tool is also copying the event
Calendar mirroring tools, phone accounts syncing the same calendar twice, and automation platforms that create a second event from a Cal ID webhook all produce apparent duplicates.Check whether the duplicate is identical or slightly different — a different title, colour, or organiser points at an external tool rather than at Cal ID. Review anything you have wired up under Apps → Installed Apps at https://cal.id/apps before changing calendar settings.
The booking was rescheduled and the old event survived
The booking was rescheduled and the old event survived
A reschedule updates the existing calendar event. If the connection was briefly unavailable, the update can land as a new event while the original remains.Cancel the stale event on the calendar and confirm the surviving one matches the time shown under Bookings → Upcoming at https://cal.id/bookings — treat Cal ID as the source of truth.Related: Cancel or reschedule a booking
The connection is broken or its permission was revoked
A calendar connection can lapse without you touching anything: a password change, a workspace admin revoking third-party app access, an Apple app-specific password regenerated, or a permission declined during the original consent screen. The tell-tale sign is a sudden change with no matching action on your side — either everything reads as busy, or nothing does.1
Open your calendar settings
Go to Settings → Calendars at https://cal.id/settings/my-account/calendars. Look for an error state, a reconnect prompt, or a connection that lists no sub-calendars at all.
2
Cross-check the installed app
Open Apps → Installed Apps at https://cal.id/apps/installed/calendar. A connection that is present but non-functional usually shows here too.
3
Reconnect and grant every permission
Reconnect the calendar. On the consent screen, grant all requested permissions — view, create, edit, and delete. Withholding delete permission, for example, leaves cancellations stranded on your calendar with everything else appearing to work.
4
Re-select your sub-calendars
After reconnecting, tick the sub-calendars you want checked for conflicts and confirm the destination calendar. These choices are not always carried over, and a reconnected calendar with nothing ticked blocks nothing.
5
Test in both directions
Add a Busy event on your calendar for a bookable slot and confirm the slot disappears from your booking page. Then make a test booking and confirm it lands on the destination calendar. Cancel both afterwards.
What happens after you reconnect
Reconnecting restores the connection; it does not replay history. Set expectations accordingly.- Conflict checking resumes immediately. As soon as the sub-calendars are ticked, your booking page reflects the busy events on them.
- Existing events are re-read, not re-created. Cal ID pulls the past 30 days and next 90 days of events for availability. Nothing on your calendar is modified.
- Bookings taken while the connection was down are not back-filled. Any confirmed booking that failed to write stays missing from the calendar. Find them under Bookings and add them manually, or cancel and rebook if the attendee needs a fresh invitation.
- Slots that were wrongly offered stay booked. If the outage caused a double-booking, resolve it yourself by rescheduling — Cal ID will not undo a confirmed booking.
- Per-event overrides survive. Any event type with its own Add events to calendar value keeps it, so check those event types individually if the connection you replaced was their destination.
Other calendar fixes
No available times
Work through every reason a booking page shows fewer slots than expected.
Add events to calendar
Choose which connected calendar stores each event type’s bookings.
Unified Calendar
See every connected calendar in one view and spot what is really booked.
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