Sometimes my phone works. Sometimes it doesn't.
Today it let me in. On Wednesday it didn't, as it didn't in the game before that, and the game before that, but worked flawlesly from the start of the season until it didn't.
I had no need to seek the assistance of the bloke standing by the turnstile with his magic box allowing me in today, the very presence of which, with the constant queues forming up behind him, sort of points to a less than perfect system.
Dunno why the 'computer says 'no' or 'yes' but that's the confusing and frustrating world we now live in today.