problem with IOTHUB creating

Hello Abdeslem Bouchabane,

Welcome to Microsoft Q&A and Thank you for sharing the error details.

I understand that your student subscription has an Azure Policy in place that restricts which regions you can deploy resources into. The error

What the error means

RequestDisallowedByAzure

indicates that your subscription (likely an Azure free student account) is restricted by an Azure Policy that limits which regions you can deploy resources into.

This is not a credit issue, but a region restriction applied to your subscription.

When you try to create an Azure IoT Hub in a region that is not part of the “Allowed Locations” list, Azure blocks the deployment with this error.

Why this happens

With certain subscription types (such as student/free accounts), Azure enforces policies to:

Allow deployments only in specific approved regions

Ensure service availability and optimal performance

Control usage and costs

Here are the few troubleshooting steps to fix the issue,

1. Verify allowed regions in your subscription

In the Azure Portal:

1. Go to Policy
2. Select Assignments
3. Look for a policy like “Allowed Locations”
4. Review the list of permitted regions
5. Choose a supported region for your IoT Hub

When creating your IoT Hub, select a region from the allowed list, for example:

East US

East US 2

West Europe

North Europe

Southeast Asia

Avoid Regions not included in your policy, Regions not supported by IoT Hub.

3. Redeploy the IoT Hub in an allowed region

Azure Portal

when creating the IoT Hub, pick an allowed region in the Region dropdown

Azure CLI example

az iot hub create \

ARM Template

Update the "location" property to one of your allowed regions

The deployment failed due to an Azure Policy restricting regions, not lack of credits

The Azure IoT Hub must be created in an allowed region

Switching to a permitted region should resolve the issue immediately.

Please refer this

iothub-westus3-disabled • ARM template / CLI / SDK IoT Hub reference: https://docs.microsoft.com/azure/templates/microsoft.devices/iothubs?tabs=json

• az iot hub create CLI docs: https://docs.microsoft.com/cli/azure/iot/hub#az-iot-hub-create

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.

Thank you!

The error indicates that the deployment is blocked by an Azure policy on the subscription, not by lack of credit or a problem with the IoT Hub template itself.

Key points from the error:

• InvalidTemplateDeployment with inner code RequestDisallowedByAzure.
• Message: “This policy maintains a set of best available regions where your subscription can deploy resources… Should you need additional or different regions, contact support.”

This means:

• The student subscription has a policy that restricts which Azure regions can be used.
• The region selected for the IoT Hub is not in the allowed list for that subscription.

To proceed:

1. Create the IoT Hub in a different region that is allowed by the subscription policy (for example, try common regions like West Europe, East US, etc., depending on what is available in the portal for that subscription).
2. If no suitable region is available for IoT Hub in the subscription, contact Azure support as the error message suggests and request that the policy be adjusted or that additional regions be enabled for the student subscription.

The deployment template itself is not the issue; the subscription-level policy is.

References:

• Troubleshoot common Azure deployment errors
• Azure iotHub client library for JavaScript - version 6.3.0
• Azure iotHub client library for JavaScript - version 2.1.0
• Azure Resource Manager IotHub client library for Java - version 1.3.0