What documents does amazon ask for when you sign up as a seller?

If verification gets stuck, don't open a second account to get around it. Amazon links accounts and that tends to end with both suspended. Keep replying to the case in the same account, with whatever extra document they ask for, and make sure any utility bill or statement you send is recent.

Roughly: a passport or national ID, a recent bank or credit card statement, a card they can charge, a bank account for payouts, a phone number, and your business details if you're registering as a company. In a lot of countries there's also a short video call to check your ID. The thing that catches people out is mismatches. Name and address have to match exactly across the ID, the statement and what you type into the form, and screenshots or cropped statements get rejected. Use the full PDF statement.