I think the root domain should be working. If the shop is subdomain, then the entire domain will be verified. If not, let me know and we will find a solution.
Hey. I have a more seperate domain verification question. When connecting my facebook to shopify, i keep getting an error message: The domain could not be verified because it was already claimed by another Business Manager account. But I only have one business manager account and I just created this month. Does anyone know how to resolve this issue?