Tengku Abdul Aziz was appointed as the Regent of Kelantan twice. The first time was when his father-in-law, Sultan Yahya Petra was visiting Japan, Taiwan and Hong Kong, where he became Regent for two months, starting from 18 April 1966 until 3 July 1966.[3] When his father-in-law underwent surgery at the General Hospital in Kuala Lumpur, Tengku Abdul Aziz served again as the Regent for two months from 13 December 1967 to 4 February 1968.[4]
Tengku Abdul Aziz was appointed as the President of State Royal Succession Council of Kelantan (Malay: Majlis Perajaan Negeri Kelantan) on 21 September 1965 before being replaced by Tengku Laksamana Kelantan Tengku Abdul Halim Ibni Almarhum Sultan Ibrahim on 25 April 2010.[5][6]
Tengku Abdul Aziz was the President of the Kelantan Islamic Religious and Malay Customs Council (MAIK) from 1 January 1967 to 31 May 1975.[7]
Tengku Abdul Aziz married Tengku Merjan, the eldest daughter of the 27th Sultan of Kelantan, Sultan Yahya Petra on 22 January 1960. As a result of this marriage, they had three sons and one daughter: Tengku Mohamad Rizam (Tengku Temenggong of Kelantan), Tengku Ramizan, Tengku Mohamad Rizal and Tengku Mohamad Ridzman.[8]
Tengku Abdul Aziz was conferred the title of Tengku Sri Utama Raja by his father-in-law, Sultan Yahya Petra in 1962.[10] Among the orders conferred upon him such as: