This is not an issue with this app, please follow the instructions with your device, you need to either set the wifi name and password on your new router to the same as you had with your old router (devices will then just re-connect), or reset the devices and re-add.
This article on the TP-Link website may help to reset the device:
How do I move my Kasa device to a different wireless network? | TP-Link
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