thank you guys, i tried authy and chrome extentions but they didn't work, they generates codes like my phone does but in poloniex i still get incorrect error. Also i tried authenticattors in 3 different phones. they always reads barcode or 16 digit code, starts generating 2FA codes but codes doesn't work in poloniex.
Seems like your only option now is just to open a support ticket but I'm sure you have heard the fact that they are very slow to respond so expect a longer waiting time.
Just make it as detailed as possible; don't forget to mention things that you already tried.
I don't know if this will help but I found an article where they mentioned a couple of solutions:
https://poloniex.freshdesk.com/support/solutions/articles/1000166431-i-lost-access-to-my-2fa-device-how-can-i-now-access-my-account-my only option now is support ticket, i already read them all. i don't know why are they so slow. thank you.