Unable to publish hosted agent in Foundry

Question

Unable to publish hosted agent in Foundry

Nimesh 60

Hi Everyone,

I created a toolbox and now I want to use this toolbox in an agent. Since Toolbox is currently not supported in UI, I am trying to create a new agent with this toolbox. But when I try to publish the agent to Foundry, I get this error message. How to enable this in my subscription? Screenshot 2026-04-29 222543

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Answer 1

Anshika Varshney 9,985 Microsoft External Staff Moderator

Hi Nimesh,

Thanks for sharing your issue.

From the error message, this usually means that the hosted agent or toolbox feature is not enabled for your subscription yet.

These features are still in preview, so they are not available to all subscriptions by default [serverfault.com]

What is happening

You are trying to publish an agent that uses toolbox or hosted agent features
Your subscription does not have access to this preview capability
Because of that, publishing fails even though your setup looks correct

What you can check

Here are a few simple checks with examples:

Check if feature is available in your subscription

Example: If you open Foundry and do not see options related to toolbox or hosted agents, it usually means the feature is not enabled

Try publishing a basic agent without toolbox

Example: Create a simple agent without adding toolbox
If this publishes successfully, then the issue is specifically with toolbox support

Check message shown during publish

Example: If you see “experience not available for this subscription”, this directly confirms it is a feature access issue

How to identify clearly

You can confirm the root cause like this:

Basic agent works, but agent with toolbox fails → feature not enabled
Nothing publishes at all → check permissions or setup
Same error across attempts → subscription level limitation

This is not a code or configuration issue

It is related to feature availability for your subscription, so everything you configured can still be correct, but publishing will fail until access is enabled.

I hope this helps. Feel free to reach out if you have any further questions.

Thankyou!

Anshika Varshney 9,985 Reputation points Microsoft External Staff Moderator

2026-05-01T09:11:27.1966667+00:00

Hi Nimesh,

We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.

Thankyou!
Anshika Varshney 9,985 Reputation points Microsoft External Staff Moderator

2026-05-04T03:08:44.2233333+00:00

Hi Nimesh,
Please let me know if the issue persists after these checks. If you have any remaining questions or need additional details, I’ll be glad to provide further clarification or guidance. If the above steps resolve your issue, kindly confirm.

Thankyou!
Nimesh 60 Reputation points

2026-05-04T03:23:36.64+00:00

This is the error I received today. Seems its supported based on the region.
Anshika Varshney 9,985 Reputation points Microsoft External Staff Moderator

2026-05-04T11:38:31.28+00:00

Hi Nimesh,

Thanks for sharing the screenshot. This error clearly explains what is going wrong.

The message says Unsupported region for Foundry Hosted Agents. So even though the feature is available, it is not available in the region where your resource is currently deployed.

Hosted agents in Foundry are not supported in all Azure regions yet. If your Foundry project or resource is created in a region where this feature is not enabled, publishing or deployment will fail with this exact error.

So your understanding is correct It is supported, but only in specific regions.

What you can do:

The main thing to check is the region of your Foundry resource.

If your current region is not supported, then

Create a new Foundry resource in a supported region Then deploy or publish your hosted agent from there

example: If your current resource is in a region like South India or West Europe and hosted agents are not supported there yet then create a new resource in a commonly supported region like East US or Sweden Central and try publishing again.

Additional small checks

Make sure the agent is deployed and active before publishing. Publishing alone is not enough, the agent backend must be running. Also ensure your tools and deployment are completed properly before publishing.

I Hope this helps. Do let me know if you have any further queries.

If this answers your query, please do click Accept Answer and Yes for was this answer helpful.

Thankyou!

Answer 2

Toolboxes in Foundry are a managed resource that can be consumed by any MCP‑compatible agent runtime or client, but they are currently in preview. The error message “The requested experience is not available for this subscription” indicates that the Foundry agents + toolbox experience is not yet enabled for the Azure subscription being used.

To proceed, the subscription must be onboarded to the Foundry preview that includes toolboxes and hosted agents. This enablement cannot be done from the portal or CLI; it requires Microsoft to enable the experience for the subscription. Open a support request with Microsoft (or work through the preview enrollment channel that was used to get Foundry access) and provide the request ID from the error so the team can enable the appropriate Foundry preview features for that subscription.

Once the subscription is enabled for the preview, the existing toolbox can be referenced from agents, and those agents can be published and consumed via the single MCP endpoint described in the toolbox documentation.

References:

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