Model Builder, Error in the remote server : (401) Not authorized.

**System Information (please complete the following information):**
- Model Builder Version (available in Manage Extensions dialog): 16.7.4
- Visual Studio Version : 17.3.1

**Describe the bug**

When I Start Model Builder for object Recognition, Using Azure with Standard NC6, tried both regions **West Europe** and **East US**, I load the images and start the training. After a while it returns an **exception 401 not authorized** and fails creating the model. This happens after a while (40 minutes after the training starts and also more..)
As I am also connected to Azure, I see that the remore machine is still working while the error appears on Model Builder.
I am trying and trying. Still getting the same issue no matter if I switch the Azure region.
I am using a custom dataset, trained with VOTT, made of 828 images and 11 labels

Error detail in Model Builder:
` in AzureML.FailureCounter.d__6.MoveNext() in /_/src/Microsoft.ML.ModelBuilder.AutoMLService/RemoteAutoML/FailureCounter.cs:riga 48
--- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione ---
in System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
in AzureML.AutoMLRunMonitoringImages.d__1.MoveNext() in /_/src/Microsoft.ML.ModelBuilder.AutoMLService/RemoteAutoML/AutoMLRunMonitoringImages.cs:riga 145
--- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione ---
in System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in AzureML.AutoMLRunnerImages.d__24.MoveNext() in /_/src/Microsoft.ML.ModelBuilder.AutoMLService/RemoteAutoML/AutoMLRunnerImages.cs:riga 186
--- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione ---
in System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in Microsoft.ML.ModelBuilder.AutoMLService.Experiments.AzureImageClassificationExperiment.d__14.MoveNext() in /_/src/Microsoft.ML.ModelBuilder.AutoMLService/Experiments/AzureImageClassificationExperiment.cs:riga 62
--- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione ---
in System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in Microsoft.ML.ModelBuilder.AutoMLEngine.d__21.MoveNext() in /_/src/Microsoft.ML.ModelBuilder.AutoMLService/AutoMLEngineService/AutoMLEngine.cs:riga 167 in StreamJsonRpc.JsonRpc.d__1431.MoveNext()
--- Fine traccia dello stack da posizione precedente dove è stata generata l'eccezione ---
in System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
in System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
in Microsoft.ML.ModelBuilder.ViewModels.TrainViewModel.<b__109_0>d.MoveNext()`

I am also sharing an image of the error here [https://ibb.co/ccrysWm](url)

**To Reproduce**
Steps to reproduce the behavior:
After setting Environment and Data, move to training and start training. After a while the training step stops with the described error in Model Builder

**Expected behavior**
End the training and create the model

**Screenshots**
Check it here : [https://ibb.co/ccrysWm](url)

**Additional context**
I tried by creating few times the Azure target machine, both in West Europe and after in East US. Result is still KO.

Inizia con FailureCounter.cs alla riga 48 e segui il percorso di monitoraggio attraverso AutoMLRunMonitoringImages.cs alla riga 145, AutoMLRunnerImages.cs alla riga 186 e AzureImageClassificationExperiment.cs alla riga 62. Riproduci l'addestramento delle immagini con la configurazione Azure indicata e verifica che l'addestramento venga completato e crei il modello invece di restituire un errore 401.

Scritto dal modello di indicizzazione a partire dal testo della issue.