In Outlook, the compose extension shows 'login required.' but in teams compose shows the full card.

[aalavandaan]

We are trying to show the auth card in message extension using BOT SDK with the below code sample. But in teams the card is visible but in outlook it i snot visible completely instead shows 'login required.'

return new MessagingExtensionResponse
{
ComposeExtension = new MessagingExtensionResult
{
Type = "auth",
SuggestedActions = new MessagingExtensionSuggestedAction
{
Actions = new List
{
new CardAction
{
Type = ActionTypes.OpenUrl,
Value = signInLink,
Title = "Bot Service OAuth",
},
},
},
},
};

[m365-agent-toolkit-assistant]

👋 Hi @aalavandaan,

Thank you for reporting this issue! We want to let you know that:

⏱️ Our team will personally review your issue
🎯 You can expect a response within 1 business day

✨ This is an AI-generated initial response
🤖 AI-Generated Preliminary Analysis:

This scenario is a known issue—message extension authentication cards work in Teams but often show "login required" (with no full card) in Outlook if not fully compliant with Outlook requirements.

Key points and solution:

1. Outlook support for message extensions:

   • Message extensions from Teams require migration to the Microsoft 365 channel to function in Outlook.
   • See GitHub Issue #8728.

2. OAuth redirect URI:

   • Ensure your Azure App Registration includes the required redirect URI:
     https://token.botframework.com/auth/web/redirect

3. Consent/permissions:

   • Users/admins must grant consent for Outlook use. If you see consent errors, explicitly grant consent in Azure AD (consent info).

Actionable steps:

• Migrate your bot to the Microsoft 365 channel.
• Update your Azure app registration with the appropriate redirect URI.
• Grant necessary consents.

For sample code and full details, see GitHub Issue #10208.

✨We'd love your feedback! Please take a moment to fill out our survey.

---

Note: This is an automated first response generated by AI. A human team member will review your issue and provide a more detailed response soon. We appreciate your patience!

[Prasad-MSFT]

Hi @aalavandaan, thanks for raising your issue. We will check this at our end and will update you accordingly.

[Prasad-MSFT]

Update:
We have raised a bug for this issue. We will inform you once we get any further update from engineering team.
Thanks!