Tei was educated at the University of the South Pacific in Suva, Fiji, graduating with a Bachelor of Arts and an MBA.[2] Before entering politics he worked for the Statistics Department, as an accountant for the Tonga Co-operative Federation, Pacific Finance and Investment, Tonga Water Board and Tonga Airport Limited.[2]
Following the death of ʻAkilisi Pōhiva Tei supported Pohiva Tuʻiʻonetoa for Prime Minister. He retained his portfolios in the Tuʻiʻonetoa's Cabinet.[6]
He was re-elected in the 2021 election.[7] On 28 December 2021 he was appointed to the Cabinet of Siaosi Sovaleni as Deputy Prime Minister, Minister for Public Enterprises, and Minister for Meteorology, Energy, Information, Disaster Management, Environment, Communications and Climate Change (MEIDECC).[8] On 13 May 2022 his election was declared void after the Supreme Court found him guilty of three counts of bribery in an election petition.[9][10] The conviction was stayed pending appeal on 26 May 2022.[11] On 9 August 2022 his appeal was dismissed, and his election confirmed as void.[12][13] He was formally unseated by Parliament on 10 August.[14] His wife Dulcie Elaine Tei won the resulting by-election.[15]