As far as we know, Indonesia only allows dual citizenship for children below the age of 18. After their 18th birthday, it is a must for them to choose one nationality.
And so, on Indonesia Diaspora Network Conference in August 12, 2019, this issue was raised. An expert from the Ministry’s Social, Culture, and Empowerment of Indonesians Abroad division, Dewi Savitri Wahab gave an opinion that the government must honour the Indonesian diaspora’s request for dual citizenship – so they can obtain legal certainty.
Dewi then said that the diaspora should able to give a clear, reasonable arguments about this dual citizenship to convince the lawmakers about this issue.
http://bit.ly/Dual-citizen-for-indonesians-in-the-future