Why can I not use sneak attack after using fury blows?

[H3avy]

Asking for my monk/rouge. Fury blow uses bonus action and sneak attack uses normal action. And the annoying that I can do both moves in reverse.

[Jaggid Edje]

Open your character sheet, go to the reactions tab, set sneak attack to "Ask". You will now be able to apply sneak attack damage to any eligible attack rather than needing to use the specific ability named "Sneak attack".

I'm not sure why you have the problem using them in the order that you do, but it's probably because if you use flurry of blows when you have an attack action available it ties in a regular attack to the flurry, whereas if it's all you have left it just does the extra blows. i.e. doing it first causes the flurry to also make an attack, then it is followed by the flurry (because in 5E that's a requirement for doing flurry of blows, it can only be used AFTER taking an attack action).

I've not played a monk yet, but there's a few abilities that work that way on other classes for that same reason.