In the old one, there was an option to set product has product identifiers, but would not know where this is in the new one, so yes contact Shopify, they will be able to assist.
@Josh_Uebergang You wrote :If your products do not have a GTIN, you need to ensure the identifier_exists field is false which will skip the GTIN requirement.
How to do it?
My products are hand made and do not have GTIN.
All the best,
@Josh_Uebergang I have that, from long time.
But In merchant cennter support told me my products are not having GTIN/MPN.
I told them my products are hand made. They wrote me back- I need to change it for "False" or "No" .
What is wrong then?
Look at the product data inside Merchant Center. That will tell you exactly what is being submitted to Shopify. If identifier_exists is set to true and you've got that checked with the Shopify app, then contact Shopify support and report the bug.