Disconfirmation is valid Scrabble Word

Is disconfirmation a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is disconfirmation valid Words with Friends?
Words with Friends YES

Definitions for DISCONFIRMATION in dictionary:

Find what other words can be done using letters: "disconfirmation"
https://scrabble-word.com/finder/disconfirmation
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