cant see TL-WA855RE tp link extender on my wifi list
1) Make sure your extender is turned on and should be connected directly to the wall socket not to any surge protector.
2) Check your Extended network name-should not be same as your existing network name
and to confirm the name, go to your router's web interface and check the ip address for your tplink extender and then open your browser and type that ip address.
then it will take you to the login page of the extender.
login with the password (default password is admin)
once you logged in, then check the extended network name.
if its same as your existing network then change it and save the settings.
After that check on your devices if its showing you the extender's network.
if it still not showing you the network then reset your extender and then reconfigure it again.