Hello  @NernakinBandhoo 

Thank you for reaching out. 

Please ensure the kasa device is accessible remotely when phone is on the mobile data, or you could try reboot one of the device and see if device are online

Then try to unlink and relink Kasa in the Google Home app

If it still does not work or have any error, can you share your  a photo of error here and share the tp-link id with us via PM, this helps us  to take a closer look at it, thank you .