Affixed izin +‎ meng- -kan.

mengizinkan (active mengizinkan, reflexive passive terizinkan, ordinary passive diizinkan, imperative izinkan, emphatic-jussive izinkanlah)

1. to allow

   Synonym: merelakan

• “mengizinkan”, in Kamus Besar Bahasa Indonesia [Great Dictionary of the Indonesian Language] (in Indonesian), Jakarta: Agency for Language Development and Cultivation – Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia, 2016