Losing my mind with the GTIN Exemption! pls help..

Im honestly going to reward someone that solves this.

im selling through printful on various websites and get around 200+ orders a day and im now trying to get acces to amazon.

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I now have a GTIN exemption on various countries but im having trouble with : the UK, CA, GB, ES, FR.

As brand i use Generic and it works on US and NE and MX but not on the others.. why is this ?

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the message i get is: :

1 of 1 Brands are not eligible for exemption

The brand you have provided requires a barcode (GTIN/UPC/EAN/ISBN) to list on Amazon. If you do not have a barcode for the product, you will find it on the packaging and/or back cover of your item.