This question is related to this other question and builds on that.
From some of the answer provided in the linked question, it would seem that the RAI for proccing sneak attack is that the enemy perceives multiple threats and it has to split the attention among them.
Silent Image's limitation is that it's not moving if not using the caster action, so the Arcane Trickster controlling it can't do both the illusion movement to be perceived as a threat AND the attack action, but it is reasonable if the illusion is moved by someone else.
But what about Mirror Images? Those move
Until the spell ends, the duplicates move with you and mimic your actions, shifting position so it's impossible to track which image is real.
just like you, so on your attack they also attack, and are perceived as a threat.
So my question is: can I enable sneak attack using my Arcane Trickster mirror images? I'd argue for a RAW no, but I'd like to hear other opinions.