Need Help! The certificate validation email I usually receive to renew certificate is not being received via email. How do I request this be fixed?

I have received emails when a certificate renewal is required in the past. However, this time I have received notification that my cert needs renewal and is pending but I have not received the validation email. I have requested a resend of the validation email many times through my ASW Certificate manager but the email is never received. I have checked junk, quarantine and all of the usual items on my side to ensure the issues isn't with my end. I have even gone to the length of changing the email with in my domain registrar to see if I receive it to another email but that is not working either. How do I get this to work before my certificate expires?