From 4f4f4124a082645cdf0b261cd96db4668592594a Mon Sep 17 00:00:00 2001
From: Cheena Malhotra <v-chmalh@microsoft.com>
Date: Fri, 4 Dec 2020 14:55:36 -0800
Subject: [PATCH] Fix Issue with System-Assigned Managed Identity in Azure
 Functions (#829)

For some reason, userId is coming as empty in this block, as reported in issue 815
---
 .../SqlClient/AzureManagedIdentityAuthenticationProvider.cs     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/AzureManagedIdentityAuthenticationProvider.cs b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/AzureManagedIdentityAuthenticationProvider.cs
index 07174e96a8..6f543d909e 100644
--- a/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/AzureManagedIdentityAuthenticationProvider.cs
+++ b/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/AzureManagedIdentityAuthenticationProvider.cs
@@ -89,7 +89,7 @@ public override async Task<SqlAuthenticationToken> AcquireTokenAsync(SqlAuthenti
                 string objectIdParameter = string.Empty;
 
                 // If user assigned managed identity is specified, include object ID parameter in request
-                if (parameters.UserId != default)
+                if (!string.IsNullOrWhiteSpace(parameters.UserId))
                 {
                     objectIdParameter = $"&object_id={Uri.EscapeDataString(parameters.UserId)}";
                     SqlClientEventSource.Log.TryTraceEvent("AcquireTokenAsync | Identity Object id received and will be used for acquiring access token {0}", parameters.UserId);