Registration fails with CREATE_UNINITIALIZED_VENDOR: FAILED - existing SP account

Fire Devices & Appstore Q&A
1

Issue: This account already has an active vendor/developer profile via
Solution Provider Portal (with an existing published app under it).

When submitting the Appstore Developer registration form as this same
account, the API call POST /settings/console/registration/api/v2/register
returns HTTP 200 with:

“HERD_WORK_FLOW”: “FAILED”
“CREATE_UNINITIALIZED_VENDOR”: “FAILED”

while all field validations pass (FirstName, LastName, EmailAddress,
CompanyName, AddressLine1/2, City, State, PostalCode, PhoneNumber all
return “VALID”) and “SAVE_USER”: “SUCCEEDED”.

This appears to be an account state conflict — the registration flow is
treating this as a brand-new vendor creation, but this account already
has an existing vendor record from the Solution Provider Portal side.

Tried: Chrome and Edge, cleared cache/cookies, disabled tracking
prevention, multiple retries — same backend response every time. Also
confirmed via browser network inspection (HAR capture) that this is a
backend workflow failure, not a frontend rendering issue.

Request: Please help sync/resolve the existing vendor record for this
account so I can access the Appstore Developer Console in order to
create a new LWA Security Profile for Advertising API access.

2

Hi,

Thanks for posting. Please note that your Amazon Appstore developer account has no connection to your Solution Provider account, as they are separate services.

Could you let us know the steps you followed to register for the Appstore developer account? Have you tried creating a developer account this way:

  1. Go to developer.amazon.com and click Sign In in the upper-right corner.
  2. Click “Create your Amazon Developer account”.

If you’re still seeing the error, please raise a Contact Us case for assistance and select Appstore > Account Administration > General Inquiries. Please include the error message you received and a timestamp of when the error occurred.