I have a MBP running OS 15.7.5, and an iMac running the same. In FindMy, my MBP can see my iPhone, and a few older Macs, but not my iMac. The iMac FindMy can see everyone else. Now, in Finder "Locations", the iMac is visible on my MBP, so sharing is everywhere enabled. Why doesn't my iMac want to be "Found"? BTW, on the iMac, FindMy is enabled in Location Services.