User unable to load "Drive UI Integration" tab within Drive API page

[AB-Vivun]

Hello,

I have a user who is trying to access the "Drive UI Integration" tab within APIs & Services > Google Drive API. This API is enabled for the project, and I am able to load this page. I have made him an Owner at the project level and that does not solve the problem for him. 

The error he receives is not permissions-related, but the Network pane in Chrome is showing a 403/Forbidden issue. 

Anyone have advice on how to unblock this user?

{
  "error": {
    "code": 403,
    "message": "Requests from referer \u003cempty\u003e are blocked.",
    "status": "PERMISSION_DENIED",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "API_KEY_HTTP_REFERRER_BLOCKED",
        "domain": "googleapis.com",
        "metadata": {
          "service": "devapps.googleapis.com",
          "consumer": "projects/648364020234"
        }
      }
    ]
  }
}