Hi Kylie, I appreciate you reaching out to us. Let me provide some information about the Google Calendar app in QuickBooks Online.

The integration from Invoice with Google Calendar has been retired on Oct 31, 2024. This is happening because recent changes to the invoice UI screens within QuickBooks Online have resulted in a stop-working. An email notification was sent to impacted customers last September 2024. Starting in November 2024, it will no longer be possible to use the Google Calendar Invoicing app.

I recommend checking the Intuit App Center to see other apps that may work for invoicing.

If there's any additional questions, I'm just a post away.