Hi,

What's the model number of your range extender? And what's the hardware version?

What's the operating system of your laptop which is no internet access?

You can try to remove the profile on your laptop, and then reconnect to the RE's wireless network to have a check.

Use windows 10 for example: https://www.tp-link.com/en/faq-918.html

If still the same, you can try to update the driver of your laptop's wireless adapter.