Has anyone enabled extranonce.subscription for Nicehash?
I've tried "stratum+tcp://sha256.eu.nicehash.com:3334#xnsub" and the miner fails to connect, without the "#xnsub" it connects fine but obviously no xnsub

Any ideas

If you want to set worker name in nicehash (to get information about breakdown for example), do this without "#xnsub" in address. Just add ".yourworkingname" (dot and name you want) after your nicehash mining address.