I had this issue with iOS and trying to get my shared user access to my Spotlight Cams. I eventually figured out a workaround through the Ring website. After logging in, going to the Settings and Users, I saw that I had all the cameras listed under the device access list. I was able to check the box through the website and had my wife check on her iOS app to verify access.
Strange that the device access list on both iOS and Android Apps had the cameras missing but the website listed everything. Weird.