You need to update the firmware. See other posts on the subject. It’s not a Naim issue. Tidal changed things over a year ago. I’m assuming from the number of posts over the past week that any “grace” period for the changeover to the new Tidal login authentication has expired :-). Once you update the firmware on the Naim device, you may still have to logout on the Naim app and then re-login to Tidal before everything works.