IPTV bros I'm getting authentication error,device ID mismatch

You are using the IPTV Stalker video add-on, correct?

If so, I would set defaults in the add-on, disable it, close Kodi, do an IPTV Reset at the Donation Checker, wait 15 minutes, start Kodi but do not enable the add-on, configure the add-on, enable the add-on.
 
I changed a couple of numbers in my Mac the adjusted those detaills in PVR stalker. I then done an IPTV reset and enabled TV in kodi and it working well. So many HD channels and everything's working so far. Everything is well with the world and that guy doing the EPG is a legend man