Hi @accounts249 

Were you expecting a big siren or flashing lights on the screen as a reminder?

Me too!

Or, at the very least a notification on the little bell in the top corner?

No - that's only for nags/upsell from Intuit/QB I'm afraid.

All that seems to happen is a small TASKS area in GETTING THINGS DONE that links to Reminders.

Check https://app.qbo.intuit.com/app/reminders when logged in to see if the invoice is in there.

Hope this helps.