Xcode Cloud not sending notification emails

I have some Test actions setup in Xcode cloud.

Under Post-Actions I have selected Notify - Success and Failures.

At the bottom it says:

You automatically receive email or Slack notifications for your builds

Yet I don't receive any emails...

If I add an email address to the Notify section, I now receive 2x emails. 1 to the email I added and 1 to the email on my account. If I change the added email to be the same as the one on my account, I get 2x emails to that address. This is as expected.

However if I remove the added email, I get no emails at all, whereas i'd expect to receive an email to my account address.