How to get the correct username & password for a UniFi camera that has already been adopted by UniFi Protect:

• Get into Protect UI https://protect.ui.com/
• Select NVR you’d like to use
• On left bottom corner click the Settings gear
• Click Advanced
• On the right side, you’ll see Device password, click REVEAL
• Copy the password
• Connect to the Camera IP through https, e.g. https://your.camera.ip.address
• Login with username ubnt and password from above
• Skip device setup, keep it in Unifi Video mode
• Enable the “Anonymous Snapshot” on the camera
• From there you should be able to access http://your.camera.ip.address/snap.jpeg