What activist was barred from becoming president after successfully winning an election?

The correct answer is Aung San Suu.

Explanation:

Aung San Suu Kyi is a Burmese policy. On March 30, 2016, he assumed the Ministries of Foreign Affairs, Energy, Education and the Office of the President. He could not assume the Presidency of the government despite the fact that the leading party, National League for Democracy (LND), won the elections held in November 2015, since the Burmese Constitution forbids occupying the post to those who have children with foreign passports and those of Suu Kyi have British nationality. Finally, the Parliament - in which the NLD has an absolute majority - elected as president of Burma Htin Kyaw, close friend of Suu Kyi and with four of the most important government ministries, Aung San Suu Kyi would go on to rule in the shadow.