Add fallback logic if user didn't logined with azure cli

Author: wyunchi-ms

shell/agents/Microsoft.Azure.Agent/Schema.cs

@@ -390,11 +390,20 @@ internal async Task CreateOrRenewTokenAsync(CancellationToken cancellationToken)
                     .GetTokenAsync(_tokenContext, cancellationToken);
             }
         }
-        catch (Exception e) when (e is not OperationCanceledException)
+        catch (Exception azureCliLoginException) when (azureCliLoginException is not OperationCanceledException)
         {
-            string message = $"Failed to generate the user access token: {e.Message}.";
-            Telemetry.Trace(AzTrace.Exception(message), e);
-            throw new TokenRequestException(message, e);
+            string message = $"Failed to generate the user access token using az cli and try to fallback to interactive browser: {azureCliLoginException.Message}.";
+            Telemetry.Trace(AzTrace.Exception(message), azureCliLoginException);
+            try {
+                _accessToken = await new InteractiveBrowserCredential()
+                    .GetTokenAsync(_tokenContext, cancellationToken);
+            }
+            catch (Exception interactiveBrowserLoginException) when (interactiveBrowserLoginException is not OperationCanceledException)
+            {
+                message = $"Failed to generate the user access token using interactive browser: {interactiveBrowserLoginException.Message}.";
+                Telemetry.Trace(AzTrace.Exception(message), interactiveBrowserLoginException);
+                throw new TokenRequestException(message, interactiveBrowserLoginException);
+            }
         }
     }