Yeah, the app is pretty amazing actually, well optimised for the screen and the controls. I’m impressed.
Additionally, it fucked up a bit for me. Back in the old days, I had a YouTube channel account. It was understandably in my main username. But they did that fuckery with Google+ and made ity all shonky. Anyway, apparently that account was “linked” to my main account, but not actually my account. I had a “brand” account. So when I signed in - no subscriptions. Zero.
But then I discovered the above and merged them and now all sorted.