[Bug] OAuth sign-in is impossible in Copilot chat (SigninCard button missing)

[justusbo]

When using a third-party OAuth connection (non-SSO) with the signin() helper, the sign-in card renders correctly in Teams, but does not render the sign-in button in Copilot chat.

Instead, Copilot chat displays only the text of the sign-in card, making authentication impossible from Copilot.

Expected behavior

When opening the bot in Copilot chat, the sign-in card should render the same way it does in Teams:

• Display sign-in text
• Display a visible Sign in button
• Allow the OAuth flow to be started from Copilot

Actual behavior

In Teams

• ✅ Sign-in card renders correctly
• ✅ Sign-in button is visible and clickable

In Copilot chat

• ❌ Only the text (Sign In to Keycloak) is displayed
• ❌ No sign-in button is rendered

Screenshots

Correct behavior in Teams

Incorrect behavior in Copilot chat

Code to reproduce

const app = new App({
  plugins: [new DevtoolsPlugin()],
  oauth: { defaultConnectionName: "keycloak" },
});

app.on(
  "message",
  async ({ signin, isSignedIn, send }) => {
    await send({ type: "typing" });

    if (!isSignedIn) {
      await send("Please sign in:");
      await signin({
        connectionName: "keycloak",
        oauthCardText: "Sign In to Keycloak",
        signInButtonText: "Sign in",
      });
      return;
    }

    await send("Hi!");
  }
);

app.event("signin", async ({ send, token }) => {
    await send(`Signed in!`);
});

[Nivedipa-MSFT]

@justusbo - Thanks for bringing this issue to our attention. We are checking this with engineering team, we will let you know once we get any updates from them.

[Nivedipa-MSFT]

Hello @justusbo - Bug has been raised for this. We will let you know once we get any updates on it.