Hello  @Extender09 ,

Welcome to our community.

Here are some troubleshooting steps to help resolve this:

Before starting, check these general items:
1. Test your router's internet by connecting another device directly to your router's Wi-Fi. If that device also has no internet, the issue is with your router/ISP connection, not the extender.
2. Check if your router has MAC filtering or Access Control (Whitelist/Blacklist) enabled — if so, disable it, as it can block the extender from accessing the internet.
3. Power cycle both your router and extender to refresh the connection.

For more detailed guidance, you can also refer to: Fail to configure the TP-Link Range Extender