Identity Information

Hi

I am looking for help concerning identity Information, Amazon was asking for Tax Return notices which I supplied but the problem is my business name is not on tax returns just my full name, Amazon said there is nothing to prove I am authorised to conduct business on behalf of the business and are now asking for power of attorney, I am the sole owner and been paying taxes since 2020.
do I need to go to Solicitors for this,
Completely new to Amazon,
Thanks for taking time to read

Gerry