Once you meet the criteria mentioned above, you can now:
Log in to your Amazon Seller Central or Vendor Central account.
Click on the Gear Icon(Settings) section.
From the drop-down, click on "User Permissions".
Under the "Add a New User" section, add the Adbrew user.
Check your mailbox for a confirmation email from Amazon.
Accept the invitation to your Seller Central / Vendor Central account.
Go to the "User Permissions" tab.
Click on "Manage Permissions" for the alias "[email protected]". (here [email protected]).
Update the permissions for the newly added alias as indicated in the illustrations below.
Click "Continue" and we are good to go.
