I get 503 when trying to GET profile using identifiers

Hi Greg, we are on Elite plan.

I can get Deal data using

client.get("deal.contact")

Only the Profile API returns 503, like the following method trying to create a mocked profile. I'm following this doc. Any configuration do we need to make to enable Profile API?

async function createMockedProfile(client) {
    const mockedProfile = {
        "profile": {
            "identifiers": [
                {
                    "type": "email",
                    "value": "dennis.xiao@example.com"
                },
            ],
            "attributes": {
                "clearedToBook": "Yes",
            }
        }
    }

    const settings = {
        url: '/api/v2/user_profiles?identifier=github:client:email:dennis.xiao@example.com',
        type: "PUT",
        contentType: 'application/json',
        data: JSON.stringify(mockedProfile)
    };

    client.request(settings).then(
        (response) => {
            console.log('response', response)
            console.log('Mocked profile created');
        },
        errorResponse => {
            console.error('Mocked profile failed to be created');
        }
    )
}

If we use `cors: true`, I would get a status of `0`. Any pointer is really appreciated. Thanks.

{
    "readyState": 4,
    "responseText": "",
    "status": 0,
    "statusText": "error"
}

function requestProfileData(client, identifierObject) {
    const { profileSource, profileType, identifierType, identifierValue } = identifierObject;
    const settings = {
        url: `https://subdomain.zendesk.com/api/v2/user_profiles?identifier=${profileSource}:${profileType}:${identifierType}:${identifierValue}`,
        type: "GET",
        cors: true,
        headers: {
            "Authorization": "secret string"
        }
    };

    console.log('settings', settings)

    client.request(settings).then(
        profileData => {
            console.log('profileData', profileData)
            displayProfileData(profileData);
        },
        errorResponse => {
            console.log('errorResponse=======', errorResponse)
            displayError(errorResponse);
        }
    );
}