I have verified my domain and also registered my email address on same domain via developer portal. However I'm still not able to send emails through Apple's private email relay service.
I get the following error:
550 5.1.1 Relay not allowed for <xxxxxx@privaterelay.appleid.com> from domain: <xxx.com>
I'm aware of this thread https://forums.developer.apple.com/thread/122270#380406.I tried sending on Gmail web (my registered email address with same domain). I also tried SendGrid. Both are unsuccessful. What did I possibly miss?