i have latest T17 firmware and it work fine nicehash. i tried overclock firmware, and in that case nicehash didn't reconized it
you have to do it by SD, bec it overide the downgrade protection.
you tried this version (Antminer-T17-user-OM-201912241613-sig_5047.tar.gz) with nicehash and it works ?
if that's the case can you please send me your kernel log file and how did you put the pools in the miner configurations same port for all the 3 or how, i will try exactly like you maybe it will work