DIAGNOSIS The solid yellow light means it's stuck in setup mode, almost always a Wi-Fi handshake failure.
FIX The fastest path is a hard reset followed by re-adding. Hold the setup button for 10+ seconds until the light goes off and comes back on solid yellow. In the Wyze app, delete the camera from your account. Go to Add Device > Wyze Cam v3 and follow the prompts, making sure your phone is on the 2.4GHz network. Enter the password exactly.
IF THAT DIDN'T WORK The camera might be too far from your router or behind too many walls. Move it temporarily within 10 feet of your router during setup, then move it back after it's online.
HEADS UP If your Wi-Fi password has special characters, the camera can sometimes choke. Try a simpler password temporarily for setup if you're desperate.