Any existing team members or admins of your team can use the Scanner App without a Scanner App Password simply by logging in.
On the Team settings page admins can set a "Scanner App password", if set the Scanner App can be accessed by going to the Scanner App URL. You can update the password at any time.
Related
How to login to WasHere Scanner App
Learn how to securely access WasHere Scanner App
How to use the Scanner App
How to scan, verify and perform actions.
Team settings
All you need to know about team settings.