Hi karlamartinezh,
Thank you for participating in the Apple Support Communities. We understand your June monthly challenge has disappeared. Oftentimes, these may reappear on their own. You may want to restart both your Apple Watch and iPhone to refresh iOS, apps and connections. Here are the steps if needed: Restart your Apple Watch - Apple Support.
"How to restart your Apple Watch if you have watchOS 9
- If your Apple Watch is charging, take it off the charger.
- Press and hold the side button until you see the power button
in the upper-right corner of the display. - Tap the power button.
- Drag the Power Off slider.
- After your watch turns off, press and hold the side button again until you see the Apple logo."
If the issue persists, contact Apple Support here: Get Support.
Take care.