The Bangladeshi Ministry of Foreign Affairs recalled Tasneem from her posting to Bangladesh's United Nations mission in June 2004.[10]
Ambassador to Thailand and Cambodia
Tasneem was appointed as the Ambassador for Bangladesh to Thailand and Cambodia on 14 November 2014.[11] She met with then-Crown Prince Maha Vajiralongkorn, representing King Rama IX, on 4 September 2015, to present her credentials.[12]
As an ambassador, it was one of Tasneem's priorities to strengthen religious tourism between the two countries.[13]
Md Nazmul Quaunine took over for Tasneem as the High Commissioner to Thailand on 23 October 2018.[14]
High Commissioner to the United Kingdom, and Ambassador to Ireland and Liberia
On 30 November 2018, Tasneem was appointed as the 20th High Commissioner to the United Kingdom, and an ambassador to Ireland and Liberia, succeeding Md Nazmul Quaunine. She became the first woman appointed to the position.[15][16]
On 21 November 2019, Tasneem met the Irish president Michael D. Higgins at the Áras an Uachtaráin in Dublin, Ireland. Tasneem thanked Higgins for his support of the Bangladeshi diaspora within Ireland, while Higgins professed his admiration of Prime Minister Sheikh Hasina sheltering of 1.1 million Rohingya refugees from neighbouring Myanmar.[19] She also openly invited Higgins to open an Irish embassy in Dhaka and to frequently hold bilateral talks to improve relations.[citation needed]
United Nations
In 2014, Tasneem was appointed as Bangladesh's permanent representative to the United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP). At the 72nd session of the commission in May 2016, she helped table a resolution titled "Regional cooperation in Asia and the Pacific to promote the conservation and sustainable use of the oceans, seas and marine resources for sustainable development", that was co-sponsored by Australia, India, and Sri Lanka, based upon Sheikh Hasina's blue economy policies.[20] The resolution passed unanimously.[21]
On 23 February 2017, at a ceremony in Dhaka, Tasneem was awarded the Atish Dipankar Peace Gold Award from deputy speaker Fazle Rabbi Miah.[23] She received the award in recognition of her work to promote interfaith dialogue and peace, particularly during her role as High Commissioner to Thailand.