how to fix deployment validation failed during the web app creation for the learning exercise in the sandbox

If you encounter a deployment validation failure during the web app creation in the sandbox, you can check the inner errors for details on what went wrong. The tracking ID provided in the error message can also be helpful in troubleshooting the issue. You may need to review the configuration settings and make any necessary corrections before attempting to create the web app again.

References:

• Troubleshoot Azure portal deployment validation issues for Azure Stack HCI, version 23H2
• Troubleshoot the failed deployment of a Kubernetes application offer
• Create a site using an ARM template (ase-pro-2)

@Mohamed Nabeel Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.

I have looked at the backend logs for the above shared information and we see the webapp deployment got failed due to this error message
SubscriptionIsOverQuotaForSku\",\"message\":\"This region has quota of 1 instances for your subscription. Try selecting different region or SKU.\"}]}]}}",

Could you please retry the deployment by selecting the different region and sku as Free tier. Once the deployment got succeeded you can scale-up the SKU based on your requirement.

Hope this helps! let me know if you have any further questions on this.