I had the 26-30 when it was on trial in East Anglia and on every monthly survey I'd point this problem out, asking that they would issue a plastic card when it launches properly.Though of course holders of a 26-30 Railcard have no choice in the matter...
I also had the exact same scenario as the OP - although I knew which app it was in, for some reason it had temporarily deleted itself at the exact moment an RPI wanted to see it. Fortunately she was not remotely as officious as the one the OP got, so she said she'd let me figure it out and come back later. Closing the app properly and reopening it seemed to get it back, though she never did come back herself...
I refuse to get a digital railcard since then.