Help with new listings


Hello everybody.
I need some information.
I’m trying to make new listings for FBA products, i have my ASINS from gs1 and i registered my own brand on trademark. The problem is that trademark goes in pending for 2 months before appear “Registered”, so i can’t enroll brand with amazon.
How can i list without my own brand? i want send to fba general products without any brand for now, but amazon doesn’t allow me to make new listings, they say that i needf my own brand.
Am i making something wrong?

Thank you