Registering as Amazon Seller without Owner

This may seem like a dumb question but bear with me!

My company is trying to register on Amazon Seller, in the contact info we put that of a company employee (not the owner) because the owner is unavailable. Obviously our registration request got denied. So my question is, how can I register the business without the business owner.

I know I need a power of attorney letter, but can someone please explain the detailed process to me?