Form notification emails never sending — both addresses

Site: preview.corestonetiling.com.au (incredible-heliotrope-b6ecc1)
Site ID: 766724c5-d239-4e1d-a69b-0a9a8fe19ffb
Form: builder-enquiry

Form detection is working correctly and submissions are captured and verified in the Forms dashboard.

I have two email notification rules configured under Emails and webhooks → Form submission notifications, both set to “New form submission” / “Any form”:

  1. admin@corestonetiling.com.au (Google Workspace)
  2. info.corestonetiling@gmail.com (Gmail)

Both are correctly saved and visible in the notifications list (screenshot attached). After multiple fresh test submissions, neither address has ever received a notification email — checked inbox, spam, and via full Gmail search. Since this affects two entirely different email providers, it doesn’t appear to be an address-specific spam/delivery issue on my end.

Could you please investigate why notification emails aren’t being sent for this site’s forms?