Had same issues with Antpool. Managed to connect only to stratum-btm.antpool.com:6666 (the other 2 are dead), it showed stats on Antpool and I was getting stable 700-80h/s, though even after 15-20 minutes, not shares have been received. Hence I've moved to uupool and it started showing a growing balance immediately. So I am sticking to it until Antpool will solve the issue.

However, http://miningpoolstats.stream/bytom is showing that Antpool has way bigger hashrate now...
Lets see