Find my friends “location not found”

A few weeks ago ALL my friends started showing “location not found” in the “Find My” app and their locations have been unavailable since. They are still sharing their location with me. They can still see my location. My iOS 14.3 is up to date. If force quitting app is swiping up on my iPhone 8 then I have done that. I have restarted my phone. Nothing seems to work.