EBC Content Issues

Dear Sellers!
We recently joined Amazon FBA and registered the brand with Amazon Brand registry.
I created EBC content for our products, but can’t apply our ASINs to the EBC content. Apparently, registered brand name and brand name in the product vital info section does not match.
Seems, I cant change it as well, to change that brand name I need to delete the listing and create new one. I shipped products to amazon warehouse already and they available for sale now.
Is there any other way editing brand name or do i have delete the listing and add them again. What happens to our products in Amazon warehouse, will they be matched or not afterwards.
What shall I do in this case, really appreciate your help please.
Thanks,
MiMi