This really should have been kept with the original post.
You stated you were having trouble with changing the name/ID
If the issue is just that you are not given the option to choose the device on log in for the second phone (that is what it is sounding like), then you appear to be doing the correct steps. The only things I might add are: 1) click the "recents" and do a close all (the app may still be open in the background), and 2) a reboot of the phone after clearing cache and storage. Again, uninstalling and reinstalling should not be needed as clearing cache and storage does essentially the same thing on android phones.
However, you never answered my last question on the other post: Are you both logging in with the same username (e-mail) and password? If so, that may be part of your problem.
Also, I did find this on a search. It might break some of your automations though if your phone is connected to any automations.
