Quick press and release this button (see picture)

Use Control Center on Apple Watch - Apple Support
DO NOT hold the button, as that brings up Emergency services.
The iPhone ping icon should be the same as before. It it is missing, then scroll the end and tap "Edit" where you can add any missing services, rearrange the icons in any order you desire.
Settings -> Accessibility -> Side Button Click Speed
“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 timing of 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.
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.