Hello Jonge277.
Welcome to Apple Support Communities. We understand the Windows app to manage iCloud passwords isn't working properly for you. Let's walk through some steps to help resolve the issue.
Did you make sure to sign in with your account information? Look at the helpful guide here:
Manage iCloud passwords on your Windows computer
Open the iCloud Passwords app and sign in
You need to sign in to the iCloud Passwords app in order to view your passwords. You also need to sign in again after a period of inactivity.
- Choose Start menu > iCloud Passwords.
- Click Sign In, then sign in with your Windows Hello.
You may need to check with the Windows documentation about setting it up:
Learn about Windows Hello and set it up
We look forward to hearing how these steps go for you.
Take care.