Gmail API: Connection Refused

When calling getCode(), getToken(code), and getEmailData(token) from the below class in succession, I get the error POST http://localhost:9000/api/email net::ERR_CONNECTION_REFUSED on

const {
      data: { messagesTotal },
      errors,
    } = await this.gmailClient.users.getProfile({
      userId: "me",
    });

I'm not able to figure out why this is, and it's the case across users, with a throttle, and with the list labels function as well. Anyone know what might be the issue?

export default class GmailClient {
  authClient;
  gmailClient;
  SCOPES = ["https://www.googleapis.com/auth/gmail.readonly"];
  constructor() {
    //grab the credentials from the json file
    const credentials = JSON.parse(
      fs.readFileSync("controllers/credentials.json").toString()
    );
    const { client_secret, client_id, redirect_uris } = credentials.web;

    this.authClient = new google.auth.OAuth2(
      client_id,
      client_secret,
      "http://localhost:3000"
    );
    this.gmailClient = google.gmail({ version: "v1", auth: this.authClient });
  }

  async getEmailData(token) {
    // no creds saved
    if (!this.authClient.credentials?.refresh_token) {
      this.authClient.setCredentials(token);
      this.gmailClient = google.gmail({ version: "v1", auth: this.authClient });
    }

    const {
      data: { messagesTotal },
      errors,
    } = await this.gmailClient.users.getProfile({
      userId: "me",
    });

    console.log("Error", errors);

    return { labels: [`Messages total ${messagesTotal}`] };
  }

  getCode() {
    const authUrl = this.authClient.generateAuthUrl({
      access_type: "offline",
      scope: this.SCOPES,
    });
    return { authUrl };
  }

  async getToken(code) {
    try {
      const { tokens } = await this.authClient.getToken(code);
      this.authClient.setCredentials(tokens);
      return { token: tokens };
    } catch (err) {
      console.log("Error: Bad User Code: ", err);
      return res.json({ token: null });
    }
  }
}

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