Getting a 401 when trying to create a conversation

Hello !
Using the node botbuilder SDK, I am trying to setup my bot to proactively create a conversation in a public channel on Teams. However, I keep getting 401 responses from the API, with no further details. You can find my code attached bellow:

const adapter = new CloudAdapter(
  new ConfigurationBotFrameworkAuthentication(
    {
      MicrosoftAppId: process.env.MS_BOT_APP_ID,
      MicrosoftAppTenantId: process.env.MS_CLIENT_ID,
    },
    new ConfigurationServiceClientCredentialFactory({
      MicrosoftAppId: process.env.MS_BOT_APP_ID,
      MicrosoftAppPassword: process.env.MS_BOT_CLIENT_SECRET,
      MicrosoftAppTenantId: process.env.MS_CLIENT_ID,
    }),
  ),
);

await adapter.createConversationAsync(
  process.env.MS_BOT_APP_ID!,
  Channels.Msteams,
  "https://smba.trafficmanager.net/teams/",
  null,
  {
    activity: {
      type: "message",
      text: "This is a test message",
      textFormat: "markdown",
    },
    bot: { id: `28:${process.env.MS_BOT_APP_ID}`, name: "Zygon" },
    isGroup: true,
    tenantId: process.env.MS_TENANT_ID,
    channelData: { channel: { id: channelId } },
  },
  console.log,
);