eero 6+ will not connect one device

The checks in more detail

The eero 6+ is a dual-band Wi-Fi 6 system, and some older or very small devices such as smart plugs and cameras use only the 2.4 GHz band, which eero shares under one network name, so it can be hard for them to find. Try joining while close to the eero, and with the phone's own Wi-Fi turned off and on. Phones with private addresses and some privacy features confuse some routers, so try turning off the private Wi-Fi address for this network. Forget the network on the device and join again.

If the app shows the device as blocked or paused, un-pause it; profiles with schedules, parental controls and filters can block a device, so check the Discover and Profiles sections. A device that connects and then drops may have a weak signal; move it closer or add a node. Restart the eero by unplugging it for thirty seconds, then wait for the light to return to solid white. If the eero is full of devices, remove old ones you no longer use. For smart home gadgets, follow their setup, which often needs the phone on 2.4 GHz. As a last step, update the eero from the app and the device's own firmware.

Take the device to the same room as the eero for the test, because a weak signal looks like a refusal to connect. Test a second device on the same network to see whether the network or the first device is at fault. If the second also fails, restart the eero and the modem. If it succeeds, the first device needs attention: forget the network, restart it, check its Wi-Fi is on and not in airplane mode, and update its system. Record the device's make and model, which helps if you need to ask eero or the maker for help.