@heuterm
Hi
It is recommended that you place the extender next to the router to reconfigure it.
APP configuration link: https://www.tp-link.com/support/faq/1373/
Troubleshooting APP configuration failure: https://www.tp-link.com/support/faq/2234/
If the above link cannot solve the problem, please provide us with a screenshot of the error message.
In addition, for configuration issues, contacting the hotline may help you resolve them faster. The hotline number is as follows:
https://www.tp-link.com/support/contact-technical-support/#Hotline-Support