Hi raylynn81,
Thank you for using Apple Support Communities. We understand you need to cancel a competition on your Apple Watch and we'd like to help.
Let's try the steps mentioned in this support article: Share your Activity and compete with friends with your Apple Watch - Apple Support
Review the section titled "Get help with Activity Sharing." If needed, you may try removing a friend using these steps:
- "Open the Activity app on your iPhone.
- Tap the Sharing tab, then tap your friend.
- Tap Remove Friend. After you remove a friend, they can't see your activity, and you can't see their activity. To start sharing again, send your friend a new invite."
These instructions are included in the same article. If the issue persists, try restarting your device and ask the recipient to restart their device as well. Make sure that the paired iPhone and Apple Watch are updated to the latest software versions for your device and the recipients.
Have a great day!