‘Trade Register’ info. requirement to register as EU seller


Hi, I have newly joined the Amazon marketplace and submitted my documents including UK VAT documents to register to sell in EU marketplaces. I have been asked to submit trade register to confirm my business activities that was issued within last 60 days. Then I submitted my VAT sales records since January this year, but it was rejected. What does this ‘ Trade Register’ mean to a sole trader like me and not have my trade mark been registered yet? Really appreciate, If someone can help me in this regard. Thanks