Problem adding a second email recipient. Cant get the verificaion code

Hi guys

I have added successfully one email recipient. It is pointing to an alias which I configured in Cloudfare.

I am doing the same process again. I was able to receive an email sending a test to the alias. Thus I suppose the forwarding is working fine.

The email I am trying to add is:

What else could be the problem?

Our email provider had blacklisted this address a few days ago due to a missing MX record. We reactivated it. Try sending a validation again.

Now it works.

Thank you.