When you say ‘hardware upgrade’ you are presumably talking about the 24/192 streaming board which is required for Tidal and some other functions, including Spotify, multiroom and BBC HLS support. Can you check that any of these other functions work?
The Tidal input should be enabled by default, and on opening it, you are normally prompted to log in. If none of this is working, I would get in tough with Naim and ask them to confirm exactly what they have done to your Uniti.
You could also check your firmware. It should be 4.7 which does include all the Tidal library. If Naim have left it at 4.6 and it got to 4.6 without going through 4.4 first, then Tidal and Spotify will be missing. This would be a schoolboy error by Naim though.
Best
David
Good to hear that you’ve solved the mystery.
There is no AirPlay support, you would need to pick up an Airport Express and a Toslink cable for that (or maybe a Chromecast Audio) so there are cheap workarounds if you need them.