Sandbox - Unable to opt-in Business Policies / optInToProgram API 500 Internal Error + Sandbox UI Er

[liniv-96]

         Hi everyone,

I am trying to opt-in to Business Policies for my eBay Sandbox user.

Here is my situation:

• I have created a valid Sandbox user account.

• I am using a valid OAuth User Token (not Application Token).

• I called the optInToProgram API via POST to https://api.sandbox.ebay.com/sell/account/v1/program/opt_in.

• Authorization header is correctly set: Authorization: Bearer {User Token}.

Issues encountered:

1. When calling the optInToProgram API with a valid User Token, I receive a 500 Internal Server Error:

{
  "errors": [
    {
      "errorId": 2003,
      "domain": "ACCESS",
      "category": "APPLICATION",
      "message": "Internal error",
      "longMessage": "There was a problem with an eBay internal system or process."
    }
  ]
}

1. When I log into Sandbox via browser (https://sandbox.ebay.com), I immediately get a UI error message:

   “There was an error. Please try again later.”

• I am unable to access the “Account Settings” page to manually opt-in to Business Policies.

• I have tried clearing cache, using incognito mode, and different browsers. The issue persists.

1. Testing with an OAuth Application Token returns 403 Forbidden as expected, confirming my User Token is valid.

---

Question:

• Is there an ongoing issue with the Sandbox environment?

• Could someone from the eBay Developer team manually enable Business Policies for my Sandbox account or help resolve this error?nk you very much for your support!