Debug in Teams shows error page

[qinzhouxu]

When debugging in Teams, an error page will be shown as below.

This is a known issue, and we are on the way of investigation.

For workaround, please upload app package on Teams client manually, or sign in Teams on the popped-up error page, then debug again.

[m365-agent-toolkit-assistant]

👋 Hi @qinzhouxu,

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 2 business days

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

Classification: Bug — this is a confirmed known issue in Microsoft 365 Agents Toolkit/Teams debug flow, not expected app behavior.

• Matching open issue: Debug in Teams shows error page #15690 (“Debug in Teams shows error page”) describes the same symptom and labels it a known issue under investigation.
• The issue body provides current workarounds: manually upload the app package in Teams, or sign in on the popped-up error page and debug again.
• Official docs say desktop debug auto-uploads the app and requires a signed-in Teams client with app upload permissions; manual upload is also an official supported path.
• I found no changelog entry in packages/vscode-extension/CHANGELOG.md indicating this specific error-page bug is fixed yet.

Upgrade check

• No verified fix version found in the toolkit changelog; fix status is still unverified.

What to do now:

1. Use the workaround: sign in on the popped-up Teams error page, then retry F5.
2. If still blocked, build/upload the app package manually in Teams.
3. Verify you’re signed into Teams desktop with an account that can upload custom apps.

Useful links:

• Debug in Teams shows error page #15690
• https://learn.microsoft.com/microsoftteams/platform/toolkit/debug-apps-in-teams-desktop-client
• https://learn.microsoft.com/microsoftteams/platform/concepts/deploy-and-publish/apps-upload

If you want, I can help draft a short customer-facing reply for the GitHub issue.

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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!