I set up my iPhone as a presence sensor and that worked pretty well, I then downloaded the app on my wife’s phone and logged in to my ST account. Now the app can’t seem to differentiate between her phone and mine for the purposes of a the presence sensor. Should I create a totally different account for her hand have her access my ST account?
Yes, she needs to have her own SmartThings identity with her own email address which then gets associated with her own phone. Here are the instructions for inviting the second person.