Hello, Does anyone know how I can get a calendar event reminder via email? When editing a calendar event, I click the reminder dropdown box and select "custom", and the only option I have for "Choose a reminder action" is "Show an alert" (see screenshot).

I'm using Thunderbird 115.6.0 (64-bit) on Windows 11, freshly installed with a few email accounts and a Gmail calendar. Everything else seem to sync and work fine. I unsubscribed\resubscribed to the calendar to no effect.