IPTV66 servers seems to be down atm.

IPTV66 Help here!
The device for which I'd changed the MAC showed Authorization Failure, but when I changed it back to the original MAC the channels showed once more after clearing cache & a reboot.

I changed my MAC on their website back to the previous working one, re-entered it in stalker settings pressed OK, cleared Kodi cache and restarted.

Now let us see.