Do we need VAT registration to open an Amazon UK account?

Our company is based in the UK, and the director is also a UK resident. I’m a bit confused about VAT when it comes to selling on Amazon. Do we need to be VAT registered right away to open an Amazon account? Or can we wait and register for VAT only after our sales exceed the UK VAT threshold? Would really appreciate insights from sellers who’ve already gone through this process. Thanks!