I am having the same problem with my first new seed. I have added about 20 trackers, and I still don't get any responses from peers. I have tried adding both a .torrent file and a magnet link. Can someone help me to understand if I am doing something wrong?
At one point, if you had "IPv6 Prefered" selected, Tixati would ONLY query for AAAA (IPv6) records, and many trackers do not have IPv6, and thus you would get Host not found.
It should query for both AAAA and A, and prefer based on you selection, but it didn't not sure if that still is the case though.
If you do not have IPv6 Prefered selected in Settings -> Network -> Connections, then this is not your issue.