diff --git a/src/libs/ReportUtils.ts b/src/libs/ReportUtils.ts
index c27d4e38589f..41560694f353 100644
--- a/src/libs/ReportUtils.ts
+++ b/src/libs/ReportUtils.ts
@@ -6091,18 +6091,27 @@ function getTaskAssigneeChatOnyxData(
             },
         );
 
-        successData.push({
-            onyxMethod: Onyx.METHOD.MERGE,
-            key: `${ONYXKEYS.COLLECTION.REPORT}${assigneeChatReportID}`,
-            value: {
-                pendingFields: {
-                    createChat: null,
+        // BE will send different report's participants and assigneeAccountID. We clear the optimistic ones to avoid duplicated entries
+        successData.push(
+            {
+                onyxMethod: Onyx.METHOD.MERGE,
+                key: `${ONYXKEYS.COLLECTION.REPORT}${assigneeChatReportID}`,
+                value: {
+                    pendingFields: {
+                        createChat: null,
+                    },
+                    isOptimisticReport: false,
+                    participants: {[assigneeAccountID]: null},
                 },
-                isOptimisticReport: false,
-                // BE will send a different participant. We clear the optimistic one to avoid duplicated entries
-                participants: {[assigneeAccountID]: null},
             },
-        });
+            {
+                onyxMethod: Onyx.METHOD.MERGE,
+                key: ONYXKEYS.PERSONAL_DETAILS_LIST,
+                value: {
+                    [assigneeAccountID]: null,
+                },
+            },
+        );
 
         failureData.push(
             {