diff --git a/src/CollaborationSession/collaborationsession.schema.ts b/src/CollaborationSession/collaborationsession.schema.ts
index 49729ea..6fbd21e 100644
--- a/src/CollaborationSession/collaborationsession.schema.ts
+++ b/src/CollaborationSession/collaborationsession.schema.ts
@@ -146,7 +146,7 @@ export class CollaborationSessionSchema extends PothosSchema {
                 scheduleDateId: scheduleDate.id,
                 // assign chat room
                 chatRoomId: chatRoom.id,
-                collaboratorsIds: [ctx.http.me.id],
+                collaboratorsIds: [...scheduleDate.participantIds],
               },
             })
             // case after start time and before end time, mark as late