Double bookings are usually a sync delay or timezone misconfiguration. Walk through these checks.
Check 1: which calendars are synced
If you have multiple work calendars (personal, team, project), the booking page only respects the ones you marked "Check availability" under booking-page settings. Add the missing calendar.
Check 2: sync latency
External calendar changes propagate to OMB Cloud within ~60 seconds. If two prospects book the same slot inside that window, both succeed. To eliminate this, enable "Lock during booking" — the slot is held while the prospect fills the form.
Check 3: your timezone
Your account timezone (in /app/perfil) and the calendar timezone (in Google/Microsoft) must match. A mismatch causes the booking page to offer slots in the wrong time. Set both explicitly; don't rely on "auto".
Check 4: prospect timezone
The booking page tries to detect the visitor's timezone via browser; if they're in a different country, confirm the slot you see ("10am EST") matches the slot they see ("4pm CET"). The agent always shows their timezone, not yours.
Fix and prevent
- Apologize and reschedule promptly — most prospects understand.
- Add the missing calendar to availability settings.
- Enable "Lock during booking" if the issue recurs.