Error calling gapi.client.oauth2.userinfo.get() getting profile information

I'm attempting to authenticate users with their google account using the implicit flow in order to retrieve that user's profile information, including:

1. Email
2. Phone number
3. Organizational information (i.e. Company Name)

    const apiKey = 'XXXXXX';
    const clientId = 'XXXXXX';
    const scopes = 'profile';
    //const scopes = 'profile https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/user.phonenumbers.read';

    let client;
    let token;
    let peopleApiDiscovery;
    const discoveryDocs = ["https://people.googleapis.com/$discovery/rest?version=v1"];

    let tokenClient;
    let access_token;

    const gapiLoad = async () => {
        let clientResponse = await new Promise((resolve, error) => gapi.load('client', resolve));
        console.log(`Load gapi.`);
    }

    const gisInit = async () => {
        tokenClient = google.accounts.oauth2.initTokenClient({
            client_id: clientId,
            scope: scopes,
            callback: async (tokenResponse) => {
                console.log(`Token response:`, tokenResponse);
                access_token = tokenResponse.access_token;
                console.log(`Finished requesting access.`);

                loadApis();

                await loadUserInfo();
            },
        });
        console.log(`Loaded token client.`);
        await gapiLoad();
        await getToken();
    }

    gisInit();

    async function loadApis() {
        let loader = [];

        loader.push(gapi.client.load('https://www.googleapis.com/discovery/v1/apis/people/v1/rest'));

        await Promise.all(loader);

        console.log('Finished loading APIs.');
    }
    
    async function loadUserInfo() {
        console.log(`Loading user info.`);

        const response = gapi.client.oauth2.userinfo.get();
        console.log(`Loaded user info: `, response.json.toString());
    }

    async function getToken() {
        await tokenClient.requestAccessToken();
    }

Everything seems to work fine until the call to userinfo.get(). I receive the exception:

Error: arrayForEach was called with a non array value

It appears that there are parameters necessary for the get method, but I can't find any documentation of them.

Here are the associated script elements:

<script src="https://accounts.google.com/gsi/client" async defer></script>
<script src="https://apis.google.com/js/api.js" async defer></script>

I've begun looking at trying to debug the obfuscated methods (which is difficult), but I get the sense that I may be doing something else wrong that I can't seem to find or figure out documentation for. Any assistance is appreciated.

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