Yes, it looks like authentication only using the MAC no longer works. I have been testing a modification that sends both login and password as part of the credential set sent to the server. It had been working like the 9.0.21, until now. Now, I can't get the channel list to load, and only limited success in getting the genre list up. The problem may be that the server requires something that my modification doesn't send, and I don't know what that is.
Again, hopefully you can get the Stalker Client to work for you. If your equipment is 'dated' you may need to upgrade.
Interesting. Do you think that the 9.0.21 modification will ever work? It's the only stalker addon I can get to work on iOS. Both pvr clients crash the kodi app on iOS.