Make canonicalizedResource lower-case (#26802)

* Make canonicalizedResource lower-case

Author: christothes

sdk/tables/Azure.Data.Tables/CHANGELOG.md

@@ -7,6 +7,7 @@
 ### Breaking Changes
 
 ### Bugs Fixed
+- Fixed an issue that caused authenticate failures when using a SAS token with a table name that contains upper-case characters. ([#26791](https://github.com/Azure/azure-sdk-for-net/issues/26791))
 
 ### Other Changes
 

sdk/tables/Azure.Data.Tables/src/Sas/TableSasBuilder.cs

@@ -41,7 +41,7 @@ public TableSasBuilder(string tableName, string rawPermissions, DateTimeOffset e
             Argument.AssertNotNullOrEmpty(tableName, nameof(tableName));
             Argument.AssertNotNullOrEmpty(rawPermissions, nameof(tableName));
 
-            TableName = tableName.ToLowerInvariant();
+            TableName = tableName;
             ExpiresOn = expiresOn;
             Permissions = rawPermissions.ToLowerInvariant();
         }
@@ -256,7 +256,7 @@ public string Sign(TableSharedKeyCredential sharedKeyCredential) =>
         /// </returns>
         private static string GetCanonicalName(string account, string tableName) =>
             // Table: "/table/account/tablename"
-            string.Join("", new[] { "/table/", account, "/", tableName });
+            string.Join("", new[] { "/table/", account, "/", tableName.ToLowerInvariant() });
 
         /// <summary>
         /// Returns a string that represents the current object.