Hello clarise112,
Thank you for reaching out to Apple Support Communities, and we'll be happy to help in any way we can. We understand you're having issues with seeing your friend's activity. Follow the steps here to see if they resolve the issue: Share your Activity with your iPhone and Apple Watch - Apple Support
"If you don't get updates about your friend's activity
As long as your iPhone can connect to the Internet and you're signed in to iCloud, you can get updates about your friend's activity each day. If your iPhone can't connect for multiple days or you sign out of iCloud, you might see missing days."
For more help, please reach out to Apple for support in resolving this issue here: Get Support
We hope this helps.
Cheers!