[9] Dato Alaihuddin was appointed as the Brunei high commissioner to Malaysia on 25 November 2014,[5] with the Sultan consenting to give him his credentials at the Istana Nurul Iman on 14 September 2014.

[10] In September 2015, a group headed by Dato Alaihuddin from Brunei paid a visit to Regional Corridor Development Authority's (RECODA) Kuching headquarters to discuss economic collaboration.

[11] In 2019, Dato Alaihuddin, during a Malaysia Healthcare Travel Council (MHTC)-hosted dinner in Kuala Lumpur, expressed hope for a friendship association between Brunei and Malaysian business owners to boost trade cooperation and leverage mutual strengths.

He highlighted the importance of including both public and private sector members to sustain public-private partnerships as key economic growth drivers.

[5] On 9 March 2021, Prince Al-Muhtadee Billah held separate audiences with the recently appointed envoys from Brunei, including Dato Alaihuddin.

[20] Dato Alaihuddin is married to Datin Hajah Mariani binti Haji Bungsu,[5] a patron of ASEAN Ladies' Circle (ALC) Brunei.