Amazon has changed the process of registration for marketers and agencies that run sponsored ads campaigns for Amazon vendors.
No longer will agencies need to submit vendor codes when registering nor wait for approval from Amazon in order to set up a new advertising account. Agencies now only need the approval of the authorized Vendor Central account holder (their client) to register an new advertising account.
If you want to set up a new account, and you are going to be advertising on behalf of an Amazon vendor, click on “Register” and then “I represent a vendor.” Once all the account details have been filled out, You will either get an email from Amazon that has instructions for requesting client approval, or send a direct email that includes instructions if you provide the appropriate email address. The email will go to the contact that manages the vendor retail relationship with Amazon via Vendor Central. After the request has been approved by the contact, you will be cleared to advertise.