New Router Problem

[wrayperson]

I installed a new router from BT today..I am connected to the laptop, but not tablet or phone..they both say " authentication problem". please can anyone tell me why everything was working fine until I installed the router

[SlackAlice]

If your laptop is connected via Wi-Fi. On your phone and tablet tell them to 'forget' the previous connection settings, then connect afresh with the same password as used on the laptop.

If the laptop is connected via cable the make sure your router is broadcasting a Wi Fi signal

[Old_Geezer]

Ensure the tablet and phone have the correct password. If all else fails turn them both off then on again (and maybe the router too).

[Tuvok]

You might have a button to press on the router before it will accept the password (new router = new password)

The button might be marked with wireless association, 2 way arrows, or wps

[Buenchico]

If the above suggestions haven't helped, 'forget' the wifi connections on both your tablet and phone:
https://www.androidcentral.com/android-101-how-forget-wifi-network

Then, on each of them, search for a wifi connection and connect to the new router. (You'll need to enter its password when you do so, of course).

That should fix the problem for you.