Is your phone rooted?  If so, maybe try this app: https://play.google.com/store/apps/details?id=org.tauruslabs.usbhostcheck

I am in Canada, so no upgrade from Bell to 5.1.1 yet for me. danba's list was created before the Lollipop update (when USB Audio used to work with all Xperia Z phones). Anyway, not sure if this has been posted here or not, but you can download a free trial of UAPP here...

Hmmm, that could be it - thanks for your reply.  I'm wondering if Sony will be releasing a fix?  I'd rather not have to factory reset/wipe my phone and do a fresh install just to get USB audio working again... but, I guess I but will if I have to... or, if installing UAPP will fix it, I'll just...

Wait, you're saying the lollipop update didn't remove USB Audio support from your Z2?!  You're the only one I've seen that has made that claim online (or did I misread/misunderstand your post?). Anyway, since mine isn't working, does anyone know if UAPP will fix this (allow my phone's USB...

In pretty much the same boat as OP... have the Fiio E12a, budget is <$200 for some new IEM's. Currently only own Xiaomi Pistons (haven't used them with the Fiio E12a yet... would that even be recommended?) As you can probably tell, I'm a noob to pretty much all things audio (but am eager...

^ Grrr... they removed the USB Audio support with the lollipop updated on the xperia z2 as well.  Would installing UAPP not work though? Isn't that what the app does (allows your phone's USB port to output audio)?  I don't want to downgrade back to kitkat!