Hello,
Please understand that when the device is connected for the first time, the mobile phone and IPT-2CH need to be on the same 2.4GHz wifi network.
If the IPT-2CH is successfully connected to the INKBIRD app, the phone can be switched to other networks.
If the phone is using a hybrid 2.4/5-GHz Wi-FI network, this may cause the phone to automatically switch to 5GHz wifi during the connection process, which will cause the connection to fail.
Because the signal range of 2.4GHz wifi will be farther than that of 5GHz wifi. If the router’s network cannot be separated, maybe you can try placing the IPT-2CH next to the router, but place the phone a little further away, will they be able to connect?
Besides, please make sure your router and phone are set up correctly.