ANSWER:

Yes, it is oblgiatory, without reciting Fateha no prayer is valid. 

Kindly refer to the following link(s):

https://youtu.be/fHxz7-tYn6w

Is it obligatory to read sura fatiha in Janaza salah

Funerals | December 4, 2017 3:51 am
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Is it permissible to hold a paper or iPhone after third Takbeer with with the funeral Du’ā from Bukhaari for the deceased if one has not memorised it? (Allaahum-maghfir lahu warhamhu…)