SMS Reminder relies on your Google Calendar to hold appointments and block busy times. If bookings aren't showing up, or times you're busy aren't being blocked, reconnecting fixes it in most cases.
Reconnect your calendar (the quickest fix)
In the Shopify admin, open the app and find the Connection section.
Click View details and choose Disconnect.
Reconnect and sign in with the Google account that holds your calendar, accepting the permissions.
This re-authorises the connection, which is what expires most often.
Bookings aren't appearing on your calendar
Check you signed in with the right Google account. If you have a personal and a work account, it's easy to connect the wrong one — the connected address is shown in the Connection section.
Check the appointment type's Linked Calendar is the calendar you're actually looking at.
Give it a minute. Sync is fast but not instant.
"Can't connect" or a 403 / access error
When you sign in with Google, accept all the permissions it asks for — if calendar access is skipped, nothing can sync.
If you're on Google Workspace and it's blocked, your workspace admin may need to allow the app before you can connect.
Your busy times aren't being blocked
Sync works both ways — appointments you take are added to Google, and times you're already busy in Google are blocked so customers can't book over them.
Confirm the events blocking you are on the connected calendar, not a different one.
Events marked Free rather than Busy in Google won't block anything. That's a Google setting on the event itself.
All-day events don't always read as busy. Give the event a real start and end time if you need it to block.
Google keeps emailing calendar invitations
That's Google, not us. Turn it off in Google Calendar under Settings → Event settings → Notifications.
Related
Set your availability
Your bookings dashboard
Send a test booking
Still stuck? Start a chat with us using the Messenger in the bottom-right corner and let us know which Google account you're connecting.