diff --git a/Runtime/Game/Requests/LootLockerBanRequest.cs b/Runtime/Game/Requests/LootLockerBanRequest.cs
index ff98da223..0c47c97e0 100644
--- a/Runtime/Game/Requests/LootLockerBanRequest.cs
+++ b/Runtime/Game/Requests/LootLockerBanRequest.cs
@@ -12,6 +12,11 @@ public class LootLockerBanInfo
         /// </summary>
         public string ban_reason { get; set; }
 
+        /// <summary>
+        /// A player-facing message describing the ban. Empty when no detail was provided.
+        /// </summary>
+        public string ban_detail { get; set; }
+
         /// <summary>
         /// The time the ban was issued, as an ISO 8601 timestamp.
         /// </summary>
diff --git a/Tests/LootLockerTestUtils/LootLockerTestConfigurationBan.cs b/Tests/LootLockerTestUtils/LootLockerTestConfigurationBan.cs
index 2a07ee457..3d02d6c9a 100644
--- a/Tests/LootLockerTestUtils/LootLockerTestConfigurationBan.cs
+++ b/Tests/LootLockerTestUtils/LootLockerTestConfigurationBan.cs
@@ -5,12 +5,21 @@ namespace LootLockerTestConfigurationUtils
 {
     public static class LootLockerTestPlayerBan
     {
+        /// <summary>
+        /// Request body for the admin ban endpoint.
+        /// </summary>
+        private class BanPlayerRequest
+        {
+            public string ban_detail { get; set; }
+        }
+
         /// <summary>
         /// Bans a player using the admin API. Creates a permanent manual ban.
         /// </summary>
         /// <param name="playerUlid">The ULID of the player to ban.</param>
         /// <param name="onComplete">Called with the raw response when the request completes.</param>
-        public static void BanPlayer(string playerUlid, Action<LootLockerResponse> onComplete)
+        /// <param name="banDetail">Optional player-facing ban message to store with the ban.</param>
+        public static void BanPlayer(string playerUlid, Action<LootLockerResponse> onComplete, string banDetail = null)
         {
             if (string.IsNullOrEmpty(LootLockerConfig.current.adminToken))
             {
@@ -21,7 +30,11 @@ public static void BanPlayer(string playerUlid, Action<LootLockerResponse> onCom
             var endpoint = LootLockerTestConfigurationEndpoints.banPlayer;
             string formattedEndpoint = string.Format(endpoint.endPoint, playerUlid);
 
-            LootLockerAdminRequest.Send(formattedEndpoint, endpoint.httpMethod, "{}", serverResponse =>
+            string json = string.IsNullOrEmpty(banDetail)
+                ? "{}"
+                : LootLockerJson.SerializeObject(new BanPlayerRequest { ban_detail = banDetail });
+
+            LootLockerAdminRequest.Send(formattedEndpoint, endpoint.httpMethod, json, serverResponse =>
             {
                 onComplete?.Invoke(serverResponse);
             }, true);
diff --git a/Tests/LootLockerTests/PlayMode/BanTest.cs b/Tests/LootLockerTests/PlayMode/BanTest.cs
index 51607ac95..08ebc0a97 100644
--- a/Tests/LootLockerTests/PlayMode/BanTest.cs
+++ b/Tests/LootLockerTests/PlayMode/BanTest.cs
@@ -131,13 +131,15 @@ public IEnumerator StartSession_ForBannedPlayer_Returns403WithBanInfo()
             string playerUlid = sessionResponse.player_ulid;
             LootLockerStateData.ClearAllSavedStates();
 
+            const string banDetail = "Banned by the integration test";
+
             bool banCompleted = false;
             LootLockerResponse banResponse = null;
             LootLockerTestPlayerBan.BanPlayer(playerUlid, response =>
             {
                 banResponse = response;
                 banCompleted = true;
-            });
+            }, banDetail);
             yield return new WaitUntil(() => banCompleted);
             Assert.IsTrue(banResponse?.success, "Failed to ban player via admin API");
 
@@ -157,6 +159,7 @@ public IEnumerator StartSession_ForBannedPlayer_Returns403WithBanInfo()
             Assert.AreEqual("player_banned", bannedSessionResponse.errorData?.code, "Expected player_banned error code");
             Assert.IsNotNull(bannedSessionResponse.errorData?.ban, "Expected ban info to be present in the error data");
             Assert.IsFalse(string.IsNullOrEmpty(bannedSessionResponse.errorData?.ban?.ban_reason), "Expected ban_reason to be populated");
+            Assert.AreEqual(banDetail, bannedSessionResponse.errorData?.ban?.ban_detail, "Expected ban_detail to round-trip through the session start error data");
         }
 
         [UnityTest, Category("LootLocker"), Category("LootLockerCI")]
@@ -178,13 +181,15 @@ public IEnumerator GetPlayerBanStatus_ForBannedPlayer_ReturnsIsBannedWithDetails
             string playerUlid = sessionResponse.player_ulid;
             LootLockerStateData.ClearAllSavedStates();
 
+            const string banDetail = "Banned by the integration test";
+
             bool banCompleted = false;
             LootLockerResponse banResponse = null;
             LootLockerTestPlayerBan.BanPlayer(playerUlid, response =>
             {
                 banResponse = response;
                 banCompleted = true;
-            });
+            }, banDetail);
             yield return new WaitUntil(() => banCompleted);
             Assert.IsTrue(banResponse?.success, "Failed to ban player via admin API");
 
@@ -203,6 +208,7 @@ public IEnumerator GetPlayerBanStatus_ForBannedPlayer_ReturnsIsBannedWithDetails
             Assert.IsTrue(banStatusResponse.is_banned, "Expected player to be banned");
             Assert.IsNotNull(banStatusResponse.ban, "Expected ban details to be populated");
             Assert.IsFalse(string.IsNullOrEmpty(banStatusResponse.ban?.ban_reason), "Expected ban_reason to be populated");
+            Assert.AreEqual(banDetail, banStatusResponse.ban?.ban_detail, "Expected ban_detail to round-trip through the ban status response");
             Assert.IsFalse(string.IsNullOrEmpty(banStatusResponse.ban?.banned_on), "Expected banned_on to be populated");
             Assert.IsTrue(banStatusResponse.ban?.permanent ?? false, "Expected permanent ban (no banned_until)");
         }