Not accepting application to sell

I have recently had a brand approval for a new product to sell, however when i try to add a product listing under my brand I am asked to apply for a prodcut approval, however when i click to apply Amazon says that they are not accepting application to sell.

I have tried contacting support but they send a generic message to say that the Amazon algorithm is not currently accepting application from my account and to try again another time. but they will not give me a time frame.

I am a new seller and this will be my first product so am not able to demonstrate any previous account metrics. i'm guessing this is part of the problem.

Anyone have any experience, is there anything i can do - i have sources from a reputable supplier have documentation and compliance certificates etc.

I'm thinking of making alternative arrangement to sell via another marketplace or directly as it seem this is unlikely to resolve itself - been tring for a month now and going around in circles.