The most common culprit is a mismatch between your phone's Wi-Fi band and what the device expects. Tapo plugs and bulbs typically require a 2.4 GHz network — if your router broadcasts only 5 GHz or a combined SSID, the pairing will fail silently. Open your router settings and either split the bands or temporarily connect your phone to the 2.4 GHz channel before adding a new device.
This usually means the device lost its connection to the cloud after a router restart or IP address change. Try the following:
If an update hangs at a certain percentage, keep the device powered and your phone on the same network for at least 10 minutes. Interrupting the process can brick the device. If it's still frozen after that, force-close the app, reopen it, and check the device status — sometimes the update completes in the background even though the progress bar freezes.
When scheduled actions stop triggering, the first thing to check is whether the device lost cloud connectivity (see offline issue above). Also confirm the time zone in your account settings matches your actual location — a wrong time zone shifts every scheduled event silently.
High latency or a dropped feed on Tapo cameras almost always points to upload bandwidth on your home network, not the camera itself. Run a speed test from the camera's location. If upload speed is below 2 Mbps, lower the stream resolution in the camera settings. Also check whether too many devices are saturating the 2.4 GHz band.
If you can't sign in, first verify you're using the correct regional server — accounts created in the EU won't work on the US server and vice versa. Reset your password only after confirming the region. If the app returns a generic authentication error repeatedly, clear the app cache or reinstall it.