Is there a way to test whether "double click"-ing the side button works?

me72543 wrote:

Is there a way to test or confirm whether double click on the side button is working? I cannot get Confirm with Assistive Touch to work because I can't get past the first double click prompt. I've tried setting the double click speed to slow then slowest and that doesn't help. Any assistance appreciated.

It sounds as if you've already determined that it doesn't work. You can try un-pairing and re-pairing the watch to see if that resolves the issue. If it doesn't it may be a hardware issue. Contact Apple and have them do diagnostics.

Getting the double press and release timing just right can be an issue. You can make it more reliable by changing:

Apple Watch -> Settings -> Accessibility -> Side Button Click Speed

After changing this I never accidentally get the Emergency Services display.

“Side Button Click Speed” can adjust the press and release timing, so you get the Control Center display every time. Adjusting The “Side Button Click Speed” is also useful for Apple Pay’s double press and release. There is “Default” (sub second press and release timing needed), “Slow” (up to a second between press and release), and “Slowest” (up to 2 seconds between press and release). I like the “Slow” setting. And as I said, I do not accidentally get the wrong display.

NOTE: Slow and Slowest settings do not mean you have to wait a full second or 2 seconds between press and release. It just means you do not need to be super fast.