Apple Watch Series 12 and Ultra 4: what to check if double tap fails

Double tap is the first thing most people try on a new Apple Watch, and when it does not fire the cause is almost always a setting rather than the hardware. Apple republished its checklist on September 14, 2026, days before Apple Watch Series 12 and Ultra 4 reach buyers on September 18. Apple Watch Ultra 4, covered by the same tap gestures...