Unsucceeded is valid Scrabble Word

Is unsucceeded a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is unsucceeded valid Words with Friends?
Words with Friends NO

Definitions for UNSUCCEEDED in dictionary:

Similar words containing SUCCEED without suffix ed and without prefix un

succeed12 succeeds13 succeeded15 succeeder14 succeeders15 succeeding16 succeedable18 succeedingly21
Find what other words can be done using letters: "unsucceeded"
https://scrabble-word.com/finder/unsucceeded
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