On 27 June 2023, HE Datin Paduka Siti Hajjar Adnin attended the 280th Meeting of the ASEAN Committee in Ottawa Heads of Mission (ACO HOMs) chaired by HE Daniel T.S. Simanjuntak, Ambassador of Indonesia.
The Ambassador of Indonesia handed over the Chairmanship of ACO to HE Datin Paduka who will be the new Chair of ACO from July to December 2023.