Thank you so much for your response!! This has definitely been a
challenge! Extremely long story short, I had email forwarding with
Shopify, but no one recognized that may have been the issue, and I of
course was clueless!! So after all the research I did on my own, I found
google mx records. When I added them, my domain info then said “g suite”
(workspace) was my email host and no longer “email forwarding”. I have now
signed up with Zoho instead and am in the process of onboarding with them.
I am hoping that after almost 3 weeks of issues, endless frustrating hours
of chatting/emails with Omnisend and Shopify, that this will soon be
resolved!!! Thanks again for trying to help me! I really appreciate it!