Make sure that you have signed up as a HYON seller and have been verified. Verified sellers will see “Verified HYON Seller” by their name in their HYON Connect profile.
When they are creating their Owner account, they can enter the email of their preferred Seller. If you are signed up as a Verified HYON Seller you will be matched with them.
If they have previously used HYON Connect and were connected with another seller, they will need to reach out to firstname.lastname@example.org to get you changed to their default seller.