How can I pin a message in group chat?

[whyrnld]

Whatszup fellas, yo give me a hand here. I'm trying to pin a message in a group but its not working. Here my code i was trying (based on message log received by event handler

My code:

message := &waProto.Message{
        ExtendedTextMessage: &waProto.ExtendedTextMessage{
          Text: proto.String("Hello, World!"),
        },
      }
      m, _ := clientWpp.SendMessage(context.Background(), group.JID, message)
      _, err := clientWpp.SendMessage(context.Background(), group.JID, &waProto.Message{
        MessageContextInfo: &waProto.MessageContextInfo{
          MessageAddOnDurationInSecs: proto.Uint32(604800),
        },
        PinInChatMessage: &waProto.PinInChatMessage{
          Key:               clientWpp.BuildMessageKey(group.JID, *clientWpp.Store.ID, m.ID),
          Type:              waProto.PinInChatMessage_PIN_FOR_ALL.Enum(),
          SenderTimestampMs: proto.Int64(time.Now().UnixMilli()),
        },
        EventMessage: &waProto.EventMessage{},
      },
      )