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I had the same issue as you on Prime day - I ended up with a Ring alarm (8 entry sensors, 2 motion), Doorbell Pro, 8 stickup/spotlight cameras, along with 3 electronic deadbolts tied to Ring.
I was able to add everything without any issues; I can see all 9 cameras in the app, and I have 3 users (2 Android, 1 iPhone). I did all the setup on an Android phone; maybe it's an iPhone-specific issue?
Thank you for confirming that information @Chris . When you get a moment, can you please double check the settings for each device in question and ensure that they are not added to a group. Additionally, if linked please try un-linking then adding a shared user. Looking forward to your response!