whoAmI respond with wrong datacenter

I make a request GET https://sjc1.qualtrics.com/API/v3/whoami and I have such a response:
{

    "result": {

        "brandId": "xxxx",

        "userId": "xxxx",

        "userName": "xxxx",

        "accountType": "UT_FREEACCOUNT",

        "firstName": "xxxx",

        "lastName": "xxx",

        "email": "xxxx",

        "datacenter": "awsireland"

    },

    "meta": {

        "requestId": "e117c57d-321a-4268-a0c8-fb5ce3d75559",

        "httpStatus": "200 - OK",

        "notice": "Request proxied. For faster response times, use this host instead: fra1.qualtrics.com"

    }

}

According to docs, datacenter is 2-3 letter. But why then I have some strange `"datacenter": "awsireland" in response?