Find my doesn’t recognize other iphones and is loading forever

Hi, I am new to iphones and I wanted to add my friends on Find My. I read every possible solution but it didn’t fix anything. I tried restarting my phone multiple times, reinstalling find my, turning the location on and off, I checked date and time and it still doesn’t work. I can only see a few of my contacts and only for 2 people it shows in blue (that they have an iphone). Either way if I try to add by searching, for some people that have an iphone it says that they are not associated with it (they already share location with other people). If I click on the blue person to add them it is loading and loading but at the end it doesn’t add them.