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It's an official rule and very clearly spelled out in the source material. You don't score a threat, and therefor do not have any chance to roll a confirmation, unless the attack hits. A natural 20 always hits (barring additional effects beyond AC such as concealment), but anything less must overcome the enemy's AC.
If you do score a threat, you still have to overcome AC (or roll a nat 20) on the second "confirmation" roll, otherwise you only hit normally.
Obviously the UI could have explained it better and if you had read the explanation in game (did you?), you would have directly understood.
Here, you have made a 15, that's potential critical hit, seen your crit-range.
You need to redo a roll, and hit, to confirm the critical hit. I assume your roll was here not enough to hit, thus no crit.