Getting an error every time I try to upload the test data via dotnet

Unhandled Exception: Microsoft.Rest.HttpOperationException: Operation returned an invalid status code 'Unauthorized' at Microsoft.Azure.CognitiveServices.Vision.CustomVision.Training.TrainingApi.GetDomainsWithHttpMessagesAsync(Dictionary`2 customHeaders, CancellationToken cancellationToken) at Microsoft.Azure.CognitiveServices.Vision.CustomVision.Training.TrainingApiExtensions.GetDomainsAsync(ITrainingApi operations, CancellationToken cancellationToken) at Microsoft.Azure.CognitiveServices.Vision.CustomVision.Training.TrainingApiExtensions.GetDomains(ITrainingApi operations) at Import.Program.Main(String[] args) in ~/AISchoolTutorials-master/sketch2code/Import/Program.cs:line 29

I keep getting this error when I try to upload the JSON data. My key is correct although in step 2 in the tutorial I couldn't complete steps 10,11,12 as there is no notepad in the quick settings tab.

Any help is greatly appreciated. Thanks!