"Magic Weapon, Legion’s", states the following (emphasis mine):
This spell functions like magic weapon (see page 251 of the Player’s Handbook), except as noted above and as follows. It affects only weapons held by allies when the spell is cast. It has no effect on ammunition.
and "Magic Weapon" states the following:
You can’t cast this spell on a natural weapon, such as an unarmed strike (instead, see magic fang). A monk’s unarmed strike is considered a weapon, and thus it can be enhanced by this spell.
Therefore, does the Legion’s version also consider the monk’s unarmed strikes are weapons held or not?