Brand Approval

Hello everyone I m trying to do wholesales but currently facing an issue for more than 3 month to get approved selling Brands like JBL, Samsung, Lego even though I provide them with the invoice they still reject it how can k get this right.

And now even when tried with white label in supplement niche they ask to provide invoice for at least 400 units even though I wanna do FBM this quantity is a lot as still trying this amazon.

I would appreciate any help and information