diff --git a/reportbuilder/classes/table/base_report_table.php b/reportbuilder/classes/table/base_report_table.php
index a2cc69612ef3e..6bbbae37d9297 100644
--- a/reportbuilder/classes/table/base_report_table.php
+++ b/reportbuilder/classes/table/base_report_table.php
@@ -186,14 +186,24 @@ public function query_db($pagesize, $useinitialsbar = true): void {
     /**
      * Override parent method of the same, to ensure that any columns with custom sort fields are accounted for
      *
+     * Because the base table_sql has "special" handling of fullname columns {@see table_sql::contains_fullname_columns}, we need
+     * to handle that here to ensure that any that are being sorted take priority over reportbuilders own aliases of the same
+     * columns. This prevents them appearing multiple times in a query, which SQL Server really doesn't like
+     *
      * @return string
      */
     public function get_sql_sort() {
         $columnsbyalias = $this->report->get_active_columns_by_alias();
         $columnsortby = [];
 
+        // First pass over sorted columns, to extract all the fullname fields from table_sql.
+        $sortedcolumns = $this->get_sort_columns();
+        $sortedcolumnsfullname = array_filter($sortedcolumns, static function(string $alias): bool {
+            return !preg_match('/^c[\d]+_/', $alias);
+        }, ARRAY_FILTER_USE_KEY);
+
         // Iterate over all sorted report columns, replace with columns own fields if applicable.
-        foreach ($this->get_sort_columns() as $alias => $order) {
+        foreach ($sortedcolumns as $alias => $order) {
             $column = $columnsbyalias[$alias] ?? null;
 
             // If the column is not being aggregated and defines custom sort fields, then use them.
@@ -208,6 +218,14 @@ public function get_sql_sort() {
             }
         }
 
+        // Now ensure that any fullname sorted columns have duplicated aliases removed.
+        $columnsortby = array_filter($columnsortby, static function(string $alias) use ($sortedcolumnsfullname): bool {
+            if (preg_match('/^c[\d]+_(?<column>.*)$/', $alias, $matches)) {
+                return !array_key_exists($matches['column'], $sortedcolumnsfullname);
+            }
+            return true;
+        }, ARRAY_FILTER_USE_KEY);
+
         return static::construct_order_by($columnsortby);
     }
 
diff --git a/reportbuilder/tests/behat/audience.feature b/reportbuilder/tests/behat/audience.feature
index 66f0d4d9b7deb..115f08db8913b 100644
--- a/reportbuilder/tests/behat/audience.feature
+++ b/reportbuilder/tests/behat/audience.feature
@@ -8,10 +8,10 @@ Feature: Configure access to reports based on intended audience
       | datatype | shortname | name  |
       | text     | fruit     | Fruit |
     And the following "users" exist:
-      | username  | firstname | lastname | email             | profile_field_fruit |
-      | user1     | User      | 1        | user1@example.com | Apple               |
-      | user2     | User      | 2        | user2@example.com | Banana              |
-      | user3     | User      | 3        | user3@example.com | Banana              |
+      | username  | firstname | middlename | lastname | email             | profile_field_fruit |
+      | user1     | User      | One        | 1        | user1@example.com | Apple               |
+      | user2     | User      | Two        | 2        | user2@example.com | Banana              |
+      | user3     | User      | Three      | 3        | user3@example.com | Banana              |
     And the following "core_reportbuilder > Reports" exist:
       | name      | source                                   | default |
       | My report | core_user\reportbuilder\datasource\users | 1       |
@@ -216,6 +216,31 @@ Feature: Configure access to reports based on intended audience
     And I should see "User 2" in the "reportbuilder-table" "table"
     And I should not see "User 3" in the "reportbuilder-table" "table"
 
+  Scenario: View configured user additional names on the access tab
+    Given the following config values are set as admin:
+      | alternativefullnameformat | firstname middlename lastname |
+    And the following "core_reportbuilder > Audiences" exist:
+      | report    | configdata |
+      | My report |            |
+    And I am on the "My report" "reportbuilder > Editor" page logged in as "admin"
+    When I click on the "Access" dynamic tab
+    Then I should see "User One 1" in the "reportbuilder-table" "table"
+    And I should see "User Two 2" in the "reportbuilder-table" "table"
+    And I should see "User Three 3" in the "reportbuilder-table" "table"
+    # Now sort each of them.
+    And I click on "First name" "link" in the "reportbuilder-table" "table"
+    And "Admin User" "table_row" should appear before "User One 1" "table_row"
+    And I click on "First name" "link" in the "reportbuilder-table" "table"
+    And "User One 1" "table_row" should appear before "Admin User" "table_row"
+    And I click on "Middle name" "link" in the "reportbuilder-table" "table"
+    And "User Two 2" "table_row" should appear before "User One 1" "table_row"
+    And I click on "Middle name" "link" in the "reportbuilder-table" "table"
+    And "User One 1" "table_row" should appear before "User Two 2" "table_row"
+    And I click on "Last name" "link" in the "reportbuilder-table" "table"
+    And "User One 1" "table_row" should appear before "User Two 2" "table_row"
+    And I click on "Last name" "link" in the "reportbuilder-table" "table"
+    And "User Two 2" "table_row" should appear before "User One 1" "table_row"
+
   Scenario: View configured user identity fields on the access tab
     Given the following config values are set as admin:
       | showuseridentity | email,profile_field_fruit |