Handle deserialization error

Source/ProofOfConcept/Services/TeslaAuthenticatorService.cs

@@ -63,13 +63,20 @@ public class TeslaAuthenticatorService
         string json = await response.Content.ReadAsStringAsync();
         
         // Deserialize
-        Token? result = JsonSerializer.Deserialize<Token>(json);
+        try
+        {
+            Token? result = JsonSerializer.Deserialize<Token>(json);
         
-        if (result is null)
+            if (result is null)
-            throw new FormatException($"Could not deserialize token response: {json}");
+                throw new FormatException("Response could not be deserialized (null).");
             
-        // Return the token response
+            // Return the token response
-        return result;
+            return result;
+        }
+        catch (Exception e)
+        {
+            throw new AggregateException($"Could not deserialize token response: {json}", e);
+        }
     }
 
     /// Retrieves a cached partner authentication token or acquires a new one if not available.