Yes, PROMULGATION is a Scrabble word!

Letter values in Scrabble US: P 3, R 1, O 1, M 3, U 1, L 1, G 2, A 1, T 1, I 1, O 1, N 1.

Is it a valid word?

PROMULGATION is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a public statement containing information about an event that has happened or is going to happen
the official announcement of a new law or ordinance whereby the law or ordinance is put into effect
the formal act of proclaiming; giving public notice