[Rendering] Adaptive Card from a custom engine agent fails to render in Microsoft 365 Copilot mobile (no card) and renders text-only (elements dropped) in Copilot chat

[swaroop-loopio]

Target Platforms

Android, iOS

SDK Version

Agent framework: Microsoft 365 Agents SDK — @microsoft/agents-hosting `1.3.1

Application Name

Microsoft Teams Copilot Chat & M365 Copilot Chat

Problem Description

Bug Report — Adaptive Card rendering on Microsoft 365 Copilot (mobile / Copilot chat)

Draft for filing against https://github.com/microsoft/AdaptiveCards (structure based on issue #9315).
All details are sourced only from the loopio_ms_teams repository.

Title

[Rendering] Adaptive Card from a custom engine agent fails to render in Microsoft 365 Copilot mobile (no card) and renders text-only (elements dropped) in Copilot chat

Target platforms

• iOS
• Android

SDK / Application versions

• Agent framework: Microsoft 365 Agents SDK — @microsoft/agents-hosting 1.3.1, @microsoft/agents-activity 1.3.1
• Agent type: Custom engine agent (bot); failing surface reports channelId = "msteams:COPILOT" (sub-channel COPILOT)
• Adaptive Card schema versions tried: 1.6, 1.5 , 1.4 — same result
• Delivery method: Bot Framework activity attachment — contentType: application/vnd.microsoft.card.adaptive via context.sendActivity(MessageFactory.attachment(card))

Description / Problem

A custom engine agent (Microsoft 365 Agents SDK) returns an Adaptive Card as a bot activity attachment. The card renders correctly on Microsoft Teams (desktop and mobile app) and on Microsoft 365 Copilot desktop/web, but fails on Copilot surfaces as follows:

• Microsoft 365 Copilot — mobile app (iOS & Android): no response renders at all. The agent's reply (the Adaptive Card message) does not appear in the conversation.
• Teams Copilot chat: the card renders only its top-level TextBlock; all other elements are dropped — the per-item Container and its nested ActionSet (with Action.OpenUrl and Action.Submit buttons) do not render. Notably, when an ActionSet is nested inside a Container, the entire parent Container disappears (so its child TextBlocks vanish too), leaving only the root-level title. (Other Adaptive Cards produced by this same agent are affected the same way: FactSet — used by the help/commands card — and Badge/ColumnSet — used to display entry tags — also fail to render on these surfaces.)

Additionally, the SDK-generated OAuth sign-in card (application/vnd.microsoft.card.oauth) does not render its sign-in button on these surfaces — only the card's fallback text shows — so users cannot authenticate.

Steps to reproduce

1. Build a custom engine agent with the Microsoft 365 Agents SDK (@microsoft/agents-hosting 1.3.1) and publish it to Microsoft 365 Copilot.
2. From the bot, send the Adaptive Card below using context.sendActivity(MessageFactory.attachment(card)).
3. Trigger the response in Microsoft 365 Copilot on iOS/Android → observe no card appears.
4. Trigger the same response in Copilot chat → observe only the top-level title renders; the entry Container and its buttons are dropped.
5. For comparison, trigger the same agent/card in the Microsoft Teams client (desktop and mobile app) and Copilot desktop/web → renders fully.

Expected behavior

The full card — title, the per-entry Container with its TextBlocks, and the ActionSet with Action.OpenUrl / Action.Submit buttons — renders on Microsoft 365 Copilot mobile and Copilot chat, as it does on Teams and Copilot desktop/web.

Actual behavior

• M365 Copilot mobile (iOS/Android): nothing renders — no card/message at all.
• Copilot chat: only the top-level TextBlock ("Library Entries") renders; each per-entry Container (text + ActionSet) is entirely dropped.

Observed: mobile Copilot shows nothing; Copilot chat shows only "Library Entries".

Sample code language

TypeScript (Node.js)

Sample code (how the card is delivered)

import { MessageFactory } from '@microsoft/agents-hosting';

const response = MessageFactory.attachment({
  contentType: 'application/vnd.microsoft.card.adaptive',
  content: card, // the JSON above
});
await context.sendActivity(response);

The OAuth sign-in card is delivered by the Agents SDK's built-in AgentApplication authorization handler (application/vnd.microsoft.card.oauth); its sign-in button does not render on these Copilot surfaces either.

Works correctly on (not affected)

• Microsoft Teams mobile app (iOS & Android): the same card renders fully, including all buttons — this is the expected behavior.
• Microsoft Teams desktop: renders fully.
• Microsoft 365 Copilot — desktop/web: renders fully.

Key point: on the same iOS/Android device, the Microsoft Teams app renders the card correctly, while the Microsoft 365 Copilot mobile app / Copilot chat does not. The only failing surfaces are M365 Copilot mobile (no card at all) and Copilot chat (text-only). Since the identical agent and identical card work on Teams (desktop and mobile) and on Copilot desktop/web, this isolates the problem to the Microsoft 365 Copilot client renderer — not the mobile OS, not the card content, and not the schema version (reproduced on both 1.5 and 1.6, 1.4).

Additional environment notes

• The failing surface reports channelId = "msteams:COPILOT" (sub-channel COPILOT). The incoming activity's clientInfo entity contains no platform field, so device type (mobile vs desktop) is not distinguishable from the activity payload.

Not Working
https://github.com/user-attachments/assets/239c3b24-6bbd-4f99-870d-16ffa7e44963
https://github.com/user-attachments/assets/9b6d47ed-5877-4906-bb17-690a1bc8b6b7

Working on Web

Screenshots

No response

Card JSON

{"type":"AdaptiveCard","version":"1.6","body":[{"type":"TextBlock","text":"Library Entries","weight":"Bolder","size":"Large"},{"type":"Container","separator":true,"spacing":"Medium","items":[{"type":"TextBlock","text":"test question","wrap":true,"weight":"Bolder","size":"Medium"},{"type":"TextBlock","text":"COMPANY","wrap":true,"isSubtle":true,"size":"Small"},{"type":"TextBlock","text":"test answer","wrap":true,"spacing":"Small"},{"type":"TextBlock","text":"Created by Jane Doe on 2026-06-10","wrap":true,"isSubtle":true,"size":"Small","spacing":"Small"},{"type":"ActionSet","actions":[{"type":"Action.OpenUrl","title":"View in Loopio","iconUrl":"icon:Open","url":"https://app.example.com/library/view/12345"},{"type":"Action.Submit","title":"See Full Entry","style":"positive","data":{"msteams":{"type":"messageBack","displayText":"","text":"Post - 12345, https://app.example.com/library/view/12345","value":"Post - 12345, https://app.example.com/library/view/12345"}}},{"type":"Action.Submit","title":"Summarize","style":"positive","data":{"msteams":{"type":"messageBack","displayText":"","text":"Summarize - 12345, https://app.example.com/library/view/12345","value":"Summarize - 12345, https://app.example.com/library/view/12345"}}}]}]},{"type":"Container","separator":true,"spacing":"Medium","items":[{"type":"TextBlock","text":"qa test","wrap":true,"weight":"Bolder","size":"Medium"},{"type":"TextBlock","text":"COMPANY","wrap":true,"isSubtle":true,"size":"Small"},{"type":"TextBlock","text":"QA ans","wrap":true,"spacing":"Small"},{"type":"TextBlock","text":"Created by Jane Doe on 2026-06-09","wrap":true,"isSubtle":true,"size":"Small","spacing":"Small"},{"type":"ActionSet","actions":[{"type":"Action.OpenUrl","title":"View in Loopio","iconUrl":"icon:Open","url":"https://app.example.com/library/view/12346"},{"type":"Action.Submit","title":"See Full Entry","style":"positive","data":{"msteams":{"type":"messageBack","displayText":"","text":"Post - 12346, https://app.example.com/library/view/12346","value":"Post - 12346, https://app.example.com/library/view/12346"}}},{"type":"Action.Submit","title":"Summarize","style":"positive","data":{"msteams":{"type":"messageBack","displayText":"","text":"Summarize - 12346, https://app.example.com/library/view/12346","value":"Summarize - 12346, https://app.example.com/library/view/12346"}}}]}]},{"type":"Container","separator":true,"spacing":"Medium","items":[{"type":"TextBlock","text":"Question 1","wrap":true,"weight":"Bolder","size":"Medium"},{"type":"TextBlock","text":"PRODUCT","wrap":true,"isSubtle":true,"size":"Small"},{"type":"TextBlock","text":"answer 1","wrap":true,"spacing":"Small"},{"type":"TextBlock","text":"Created by Jane Doe on 2026-06-09","wrap":true,"isSubtle":true,"size":"Small","spacing":"Small"},{"type":"ActionSet","actions":[{"type":"Action.OpenUrl","title":"View in Loopio","iconUrl":"icon:Open","url":"https://app.example.com/library/view/12347"},{"type":"Action.Submit","title":"See Full Entry","style":"positive","data":{"msteams":{"type":"messageBack","displayText":"","text":"Post - 12347, https://app.example.com/library/view/12347","value":"Post - 12347, https://app.example.com/library/view/12347"}}},{"type":"Action.Submit","title":"Summarize","style":"positive","data":{"msteams":{"type":"messageBack","displayText":"","text":"Summarize - 12347, https://app.example.com/library/view/12347","value":"Summarize - 12347, https://app.example.com/library/view/12347"}}}]}]}],"$schema":"https://adaptivecards.io/schemas/adaptive-card.json"}

Sample Code Language

No response

Sample Code

No response