I got a new phone today, mostly working. Keeps telling me when I sign into an app that I am signed into the app on another device (aka old phone) and I cannot find my saved passwords.

Your saved passwords, if stored in the iCloud keychain, will be under the Passwords tab (with the symbol of a key) in system preferences.

Assuming your previous password is an iPhone.

For specific passwords, I’d recommend trying to request a reset with the website/app if you have forgotten them and don’t have them stored anywhere.

Hope that helps. Let me know if I could help further.