@Mohammad_Refaie Hi, It is suggested to refer to the following post first: Wi-Fi Range Extender Causing Host Router No Internet Thank you very much and best regards.

@BT-Pinehaven Hi, what is the model number of your range extender? It is suggested to refer to the following suggestions first: Recommended settings on the host router to work well with TP-Link Range...

@Skkarishma1234 Hi, May I know the model number of your range extender? It is suggested to refer to the following suggestions: TP-Link Range Extender Setup (Range Extender Mode) Unable to Connect to...

@PerryW Hi, May I know the hardware version of your TL-WA855RE? It is suggested to install the firmware here first: Wi-Fi Range Extender Causing Host Router No Internet Thank you very much and best...

@Sassue Hi, Do you mean TL-WA855RE only supports 2.4GHz and you wish to have both 2.4+5GHz bands? If yes, you might need to replace it with another dual-band model, such...

@36ty Hi, Thanks for the update. Could you please refer to this link to help me submit the Deco App logs: How to submit Deco APP log Wait for your reply and best regards.