Unauthorized exception message when trying to contact cognitive service in Azure - azure

Question

I am trying to make a simple image analysis project using AI-tools for Visual Studio. I have created an Azure Cognitive Service as a ComputerVision service. It has been more than 10 minutes since I created it so the api keys should be valid. Then I created a new project by right clicking on it. But when I run it then I get this exception:
Please input image url or locate a local image file. If input is empty, example image will be used.
No url or file specified, use the example https://oxfordportal.blob.core.windows.net/vision/Analysis/1-1.jpg
One or more errors occurred.
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at GetImageDetailsService.Program.Main(String[] args) in C:\Users\X\Documents\Visual Studio 2017\Projects\CognitiveServiceTest\GetImageDetailsService\Program.cs:line 27
Microsoft.Azure.CognitiveServices.Vision.ComputerVision.Models.ComputerVisionErrorException: Operation returned an invalid status code 'Unauthorized'
at Microsoft.Azure.CognitiveServices.Vision.ComputerVision.ComputerVisionAPI.<DescribeImageWithHttpMessagesAsync>d__30.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.Azure.CognitiveServices.Vision.ComputerVision.ComputerVisionAPIExtensions.<DescribeImageAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.GetResult()
at Microsoft.CognitiveServices.Samples.ComputerVisionApiExtensions.<DescribeImage>d__2.MoveNext() in C:\Users\X\Documents\Visual Studio 2017\Projects\CognitiveServiceTest\GetImageDetailsService\ComputerVisionApiExtensions.cs:line 34
Apparently I am not authorized. What can be causing this?
I am logged into my Azure subscription and I have funds (I am using F0 tier). I have also checked that the region is correct and that the api key matches.
Edit: When I change the api key to something different in the application call then I still get an unauthorized exception.
Edit2: Added code that calls the api.
var client = new ComputerVisionApiExtensions(ComputerVisionSubscriptionKey, ComputerVisionRegion, null);
var result = client.DescribeImage(imagePath).Result;

Answer 1

I was getting the same thing and thought it would be worthwhile to submit an issue. I got a response for a fix, tested it, and it all worked!
To solve the issue, just put this.AzureRegion = GetRegion(region); inside the constructor in the ComputerVisionApiExtensions.cs file.

Answer 2

For the Computer Vision API type of Azure Cognitive Services, the request for analyzing an image would look like as follows:
POST https://{location-of-your-Computer-Vision-API}.api.cognitive.microsoft.com/vision/v1.0/analyze?visualFeatures=Categories&language=en
Host: {location-of-your-Computer-Vision-API}.api.cognitive.microsoft.com
Content-Type: application/json
Ocp-Apim-Subscription-Key: {subscription-key-under-the-same-region-of-your-Computer-Vision-API}
{"url":"https://oxfordportal.blob.core.windows.net/vision/Analysis/1-1.jpg"}
Note: You must use the same region in your REST call as you used to
get your subscription keys. For example, if you got your
subscription keys from westus, replace "westcentralus" in the URL
below with "westus".
If your Azure Cognitive Services is under East Asia, while you use the subscription key to request westcentralus.api.cognitive.microsoft.com instead of eastasia.api.cognitive.microsoft.com, then you could get 401 Access Denied and the following response:
{
"statusCode": 401,
"message": "Access denied due to invalid subscription key. Make sure to provide a valid key for an active subscription."
}
You could use fiddler to capture the network traces when running your application to narrow this issue. Also, you could follow the detailed tutorials under "RESOURCE MANAGEMENT > Quick start" of your Cognitive Services via Azure Portal.