I do not have iphone either, but based on my observations many (most?) iphone owners have disabled safari location services from the os side, so you can't just allow them from the permission popup, but you need to go to the os settings and enable them for safari before you can bypass the permission popup. Again, I do not own an iphone, so not sure if it is exactly like this, but something like that needs to be done in many iohones trying to access location data from safari.