Unable to deploy/use Claude models in AI Foundry project

Question

Unable to deploy/use Claude models in AI Foundry project

Kartik Roy 0

I have created a project and attempted to deploy multiple models. Deployments for models other than Anthropic Claude are working as expected. However, when trying to deploy or use Claude models, an error occurs stating: “User not found.”

A screenshot of the error has been attached for reference.
User's image

Anshika Varshney 15,625 Reputation points Microsoft External Staff Moderator

2026-05-25T07:28:43.35+00:00

Hi @Kartik Roy

This issue usually happens due to some specific requirements for Claude models in Azure AI Foundry. Since other models are working fine and only Claude is failing with a “User not found” error, it is most likely related to subscription, region, or access configuration.

First, please check your subscription type. Claude models are not supported on all Azure subscriptions. They require an Enterprise Agreement or MCA‑E subscription. If you are using a normal Pay-As-You-Go or CSP subscription, the deployment may fail. In that case, try using a supported subscription.

Next, verify Azure Marketplace access. Claude models are provided through Marketplace, so your subscription must allow Marketplace purchases, and the Anthropic offer must be enabled. If Marketplace access is disabled or restricted, deployment will not work.

Also check the region of your Foundry resource. Claude models are currently available only in specific regions such as East US 2 and Sweden Central. If your project is created in another region, deployment will fail. You may need to create a new Foundry resource in a supported region and deploy again.

Another important point is permissions. Make sure your account has at least Contributor role on the resource group that contains the Foundry resource. Without proper access, you may see errors like this.

If you are calling the model using API, please also check authentication. Ensure your API key is valid and not expired, or if you are using Entra ID, confirm the correct scope is used and required roles are assigned.

Lastly, in some cases during preview, Claude deployments may show zero quota or provisioning issues. This can block deployment even if everything looks correct. [opentools.ai]

For more details, you can refer to the official documentation here Deploy and use Claude models in Microsoft Foundry

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

Thankyou!
Anshika Varshney 15,625 Reputation points Microsoft External Staff Moderator

2026-05-26T15:56:32.7566667+00:00

Hi @Kartik Roy

Just checking back to see if you’re still facing the same issue. If the problem persists, please share a few more details and we’ll be happy to help you further.
Anshika Varshney 15,625 Reputation points Microsoft External Staff Moderator

2026-05-28T10:15:47.09+00:00

Hi @Kartik Roy

Please let me know if there are any remaining questions or additional details, I can help with, I’ll be glad to provide further clarification or guidance.

Thankyou!

1 answer

Your answer

Anshika Varshney 15,625 Reputation points Microsoft External Staff Moderator

2026-05-26T15:56:32.7566667+00:00

Hi @Kartik Roy

Just checking back to see if you’re still facing the same issue. If the problem persists, please share a few more details and we’ll be happy to help you further.
Anshika Varshney 15,625 Reputation points Microsoft External Staff Moderator

2026-05-28T10:15:47.09+00:00

Hi @Kartik Roy

Please let me know if there are any remaining questions or additional details, I can help with, I’ll be glad to provide further clarification or guidance.

Thankyou!

Answer 1

The “User not found” message when deploying or using Claude models in Microsoft Foundry is typically caused by subscription, region, or permission issues specific to Claude deployments.

Use the following checks and fixes:

Confirm subscription eligibility for Claude
Claude models in Foundry require an Enterprise or MCA-E subscription. If the project is using a non‑Enterprise or non‑MCA‑E subscription, Claude deployments will fail. In that case, move the Foundry resource to, or recreate it in, an eligible subscription.
Verify Marketplace access for Claude
The banner in the screenshot indicates that Azure Marketplace configuration is required. Ensure that Marketplace purchases are enabled for the subscription and that the Anthropic/Claude offer is allowed. If Marketplace access is disabled or restricted, Claude deployments cannot be created.
Check region support
Claude models are only supported in East US 2 and Sweden Central. Make sure the Foundry resource and the deployment’s Resource location are one of these regions. If the project or deployment is in another region, recreate the Foundry resource and deployment in a supported region.
Validate permissions on the resource group
Ensure the account has at least Contributor or Owner on the resource group that contains the Foundry resource. Without sufficient permissions, Claude deployments and calls can fail with authorization‑style errors.
If using Entra ID or API calls, verify auth configuration
When calling Claude deployments via API:
- For API key auth, verify the key is valid and not expired.
- For Entra ID auth, ensure the token uses the scope https://ai.azure.com/.default and that the Cognitive Services User role is assigned on the Foundry resource.
Recreate the deployment if it remains stuck
If all the above are correct and the deployment still fails or remains in a bad state, delete the Claude deployment and create it again in the same supported region and subscription. This has resolved similar provisioning issues for other users.

After these steps, retry deploying the Claude model in the supported region and subscription with Marketplace enabled and correct permissions; subsequent API usage should succeed without the “User not found” error.

References: