First, add this to your Home Screen

iPhone only allows notifications for apps on your Home Screen.

Open this page in Safari.
Tap the Share button (the square with an arrow, at the bottom or top of the screen; you may need to tap ••• first).
Scroll down and tap Add to Home Screen, then Add.
Close Safari and open Pitch Caller from the new icon on your Home Screen.
Come back to this screen and tap Enable notifications, then tap Allow.

Needs iOS 16.4 or newer. Check in Settings → General → About → iOS Version.

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Get pitch calls as notifications on your iPhone and Apple Watch.

Your watch shows the notification only when your iPhone is locked (screen off) and the watch is on your wrist and unlocked.
Turn off Focus / Do Not Disturb on game day, or allow Pitch Caller in it.
On iPhone: Settings → Notifications → Pitch Caller → turn on Allow Notifications, Sounds and Banners.
In the Watch app on iPhone: Notifications → make sure Pitch Caller (or "Mirror iPhone alerts") is on.
You should get a "You're connected" notification right after enabling. If you don't, see the tips above.