My check-in did not send

The app tells confirmed apart from not-yet-delivered. Do not treat a local tap as server acceptance.

What to do

Look for Confirmed on the switch. Until you see it, the service has not accepted the check-in.
If it says it was not delivered, the switch offers Hold to retry.
If you have no signal, press anyway. Your phone holds the press and sends it when it can, with the time you pressed.
If a code is required (passcode or pattern), enter it again; check-ins are not accepted without it.
If the problem persists, check the status page, and contact support.

If you use a repeating window, a check-in made before the window opens is not accepted. The switch shows when the window opens.