diff --git a/src/controllers/api/missionInventoryUpdateController.ts b/src/controllers/api/missionInventoryUpdateController.ts
index bde1c3cf..ff181e0b 100644
--- a/src/controllers/api/missionInventoryUpdateController.ts
+++ b/src/controllers/api/missionInventoryUpdateController.ts
@@ -3,7 +3,7 @@ import { getJSONfromString } from "@/src/helpers/stringHelpers";
 import { getAccountIdForRequest } from "@/src/services/loginService";
 import { IMissionInventoryUpdateRequest } from "@/src/types/requestTypes";
 import { addMissionInventoryUpdates, addMissionRewards } from "@/src/services/missionInventoryUpdateService";
-import { getInventory } from "@/src/services/inventoryService";
+import { generateRewardSeed, getInventory } from "@/src/services/inventoryService";
 import { getInventoryResponse } from "./inventoryController";
 import { logger } from "@/src/utils/logger";
 import { IMissionInventoryUpdateResponse } from "@/src/types/missionTypes";
@@ -63,6 +63,7 @@ export const missionInventoryUpdateController: RequestHandler = async (req, res)
         missionReport.MissionStatus !== "GS_SUCCESS" &&
         !(missionReport.RewardInfo?.jobId || missionReport.RewardInfo?.challengeMissionId)
     ) {
+        inventory.RewardSeed = generateRewardSeed();
         await inventory.save();
         const inventoryResponse = await getInventoryResponse(inventory, true);
         res.json({
@@ -81,6 +82,7 @@ export const missionInventoryUpdateController: RequestHandler = async (req, res)
         ConquestCompletedMissionsCount
     } = await addMissionRewards(inventory, missionReport, firstCompletion);
 
+    inventory.RewardSeed = generateRewardSeed();
     await inventory.save();
     const inventoryResponse = await getInventoryResponse(inventory, true);
 
diff --git a/src/services/missionInventoryUpdateService.ts b/src/services/missionInventoryUpdateService.ts
index cb55fc69..fcb6f0a4 100644
--- a/src/services/missionInventoryUpdateService.ts
+++ b/src/services/missionInventoryUpdateService.ts
@@ -750,11 +750,6 @@ export const addMissionRewards = async (
         return { MissionRewards: [] };
     }
 
-    if (rewardInfo.rewardSeed) {
-        // We're using a reward seed, so give the client a new one in the response. On live, missionInventoryUpdate seems to always provide a fresh one in the response.
-        inventory.RewardSeed = generateRewardSeed();
-    }
-
     //TODO: check double reward merging
     const MissionRewards: IMissionReward[] = getRandomMissionDrops(inventory, rewardInfo, wagerTier, firstCompletion);
     logger.debug("random mission drops:", MissionRewards);
@@ -1423,6 +1418,11 @@ function getRandomMissionDrops(
         if (rewardManifests.length != 0) {
             logger.debug(`generating random mission rewards`, { rewardManifests, rotations });
         }
+        if (RewardInfo.rewardSeed) {
+            if (RewardInfo.rewardSeed != inventory.RewardSeed) {
+                logger.warn(`RewardSeed mismatch:`, { client: RewardInfo.rewardSeed, database: inventory.RewardSeed });
+            }
+        }
         const rng = new SRng(BigInt(RewardInfo.rewardSeed ?? generateRewardSeed()) ^ 0xffffffffffffffffn);
         rewardManifests.forEach(name => {
             const table = ExportRewards[name];