m0useanswered grow question 3 years ago I think GangaReaper is right, they also kinda look like white flies, pic is a bit blurry. If they not flying its not a white fly.
Could try some yellow sticky traps and taking a macro photo of one of them caught.
Treatment is going to be limited in flower, can open that up to some options if you wash the buds after.
Some treatments are not washed off so easily.
Good Luck!