type Account<P = any> = {
    readonly id: string;
    readonly aadObjectId?: string;
    readonly role: Role;
    readonly name: string;
    readonly properties?: P;
    readonly membershipSources?: MembershipSource[];
};

    email
    givenName
    id
    name
    objectId
    surname
    tenantId
    userPrincipalName
    userRole

app.on("install.add", async (context) => {
  const members = await context.api.conversations.members(context.activity.conversation.id).get();

  const user = members[0];
  await context.send(new MessageActivity(`Hello ${user.givenName}, thanks for adding me! 🖐️`).addAiGenerated());
});