Microsoft Teams Bot Always Fails Validation

Question

Microsoft Teams Bot Always Fails Validation

Alfredo Matos 20

I’m blocked on Microsoft Teams store validation for a bot app. This is a new setup created this week (although the app has been in development for the past weeks).

How the bot was provisioned:

The app was configured from the Teams developer flow.
In Teams Developer Portal, I added the Bot feature to the Teams app and configured the app there.
The bot works in testing, gets installed on the org, team, and works properly
Bot Framework test works
The app receives Teams webhook traffic correctly
Teams App validation fails consistently (inside the Developer App in Teams)

Screenshot 2026-03-26 at 11.20.07

Tested alternatives:

Create a bot through the Azure Bot service, with similar problems, ending in 401's and validation failure;
Tested single/multitentant in the App Registration

Observed behavior:

Teams Store validation reports failures for welcome messages and command responses.
Teams validation also reported that the
Runtime logs showing successful inbound activity handling and outbound 401 failures

Questions:

What is the supported configuration for a newly created Teams bot intended for Teams Store validation?

should the Azure Bot remain Single Tenant while the Entra app is Multiple Entra ID tenants?
should we just ignore app Validation entirely in Teams?
Is there a single definitive guide/resource to setting this up?

Just like to add, this has been one of the most frustrating experience I've had to endure as a developer. There are literally dozens of documents, and most are not aligned. There is no clear guide for this, and the failures are always opaque, and the guidance to checking the errors is usually redo the steps, which ends up on the same place.Screenshot 2026-03-26 at 11.20.07.png

Alfredo Matos 20 Reputation points

2026-03-26T11:20:34.1166667+00:00

Just added a clarification that by Store validation, I mean the App Validation flow inside the Teams Developer App.

Answer accepted by question author

0 additional answers

Your answer

Alfredo Matos 20 Reputation points

2026-03-26T11:20:34.1166667+00:00

Just added a clarification that by Store validation, I mean the App Validation flow inside the Teams Developer App.

Answer 1

Hi @Alfredo Matos

Regarding your questions:

Supported configuration for a newly created Teams bot intended for Teams Store validation

For newly created Microsoft Teams bots intended for Teams Store validation, Microsoft supports Single‑Tenant bots or bots using User‑Assigned Managed Identity (UAMI).

Microsoft has deprecated the creation of new multi‑tenant bots in the standard Azure Bot Service configuration. While existing multi‑tenant bots will continue to function, new bots are required to use Single‑Tenant or Managed Identity–based authentication. Therefore, your approach of keeping the bot Single‑Tenant is aligned with Microsoft’s current supported and recommended patterns for newly created Teams bots.

User's image

You can refer via: Register a bot with Azure
Regarding to bypass Teams app validation
This might depend on your distribution strategy, such as:

-Public Teams Store or External Distribution: If you plan to publish the app to the public Microsoft Teams Store or distribute it to external tenants, validation is mandatory. Apps that fail this validation cannot be listed.

User's image

-Internal or Line-of-Business (LOB) App: If the bot is strictly for internal use and will be distributed via sideloading or your Tenant App Catalog, you can technically bypass the Developer Portal validation flow.

However, I strongly recommend against simply ignoring it. Ignoring the validation process does not mean the underlying issues aren't real. Many validation issues, such as missing proactive welcome messages, outbound 401 authentication errors, and bots failing to respond to basic commands, are genuine production issues. These issues may not surface during standard sideload testing in a controlled environment or often appear later during edge cases or unpredictable cross-tenant interactions.

So, while validation can technically be skipped for internal LOB apps, its failures should still be treated as vital early-warning signals for authentication or architectural misconfigurations, rather than false positives.

Guide/resources for this configuration

I have found a few relevant articles that might help provide additional clarity. You may refer to the following resources:

Teams Store validation guidelines

Format your bot’s welcome message and proactive messaging

I hope this helps.

Please feel free to correct me if I misunderstood your request. If you have any additional concerns, feel free to comment below. I would be more than happy to assist.

Note: Please follow the steps in [our documentation] to enable e-mail notifications if you want to receive the related email notification for this thread.

Alfredo Matos 20 Reputation points

2026-03-26T17:22:52.5633333+00:00

Hi @Hin-V thanks for your response. That confirmed at least what I was doing, and got me to question whether to use the botframework as endpoint or to specify the bot's tenant id explicitly for operations.I went ahead and used the tenant id for obtaining the tokens, and I can now post the welcome messages with a 200 OK.

Thank you.
Hin-V 14,765 Reputation points Microsoft External Staff Moderator

2026-03-27T07:29:29.9933333+00:00

Hi @Alfredo Matos

Thank you for your feedback.

I’m glad to hear that your concern has been resolved. If you found my response partially helpful, you could consider to upvote it or mark it as the accepted answer. This helps others in the community who may encounter similar issues and contributes to the growth and value of our forum by strengthening shared knowledge and support.

If you have any further questions or need additional clarification, please don’t hesitate to reach out.

Warm thanks, and have a nice day.

Share via

Microsoft Teams Bot Always Fails Validation

0 additional answers

Your answer