Content Understanding Studio: Adding Microsoft Foundry Resource: Defaults have not yet been set Error

I had a fresh Microsoft Foundry resource created and when attempting to add the resource into Content Understanding Studio, I made sure to check "Enable auto-deployment for required models if no defaults are available."

Content Understanding Studio: Add new connected resource

But I was still getting the following error.

Content Understanding Studio: Add new connected resource

Upon checking it was on, 

GET: https://{foundry-resource}.cognitiveservices.azure.com/contentunderstanding/defaults?api-version=2025-11-01

{
  "error": {
    "code": "InvalidRequest",
    "message": "Invalid request.",
    "innererror": {
      "code": "DefaultsNotSet",
      "message": "Defaults have not yet been set. Call 'PATCH /contentunderstanding/defaults' first."
    }
  }
}

The fix is (as mentioned in the error message), manually call the PATCH endpoint with an empty body before adding the resource.

curl --location --request PATCH 'https://{foundry-resource}.cognitiveservices.azure.com/contentunderstanding/defaults?api-version=2025-11-01' `
--header 'ocp-apim-subscription-key: {ocp-apim-subscription-key}' `
--header 'Content-Type: application/json' `
--data '{
    
}'

Once this PATCH request is made, the Foundry resource gets added successfully without any errors.

This appears to be a bug. When "Enable auto-deployment for required models if no defaults are available" is checked, the PATCH call should be handled internally by the Studio.

Happy Coding.

Regards,

Jaliya