@Steve552 Any device that was connected to your old router will need to be setup from scratch again to your new router. You’ve changed the access point ie you have a new router and that has a new name of your network and that postcode for that access point is now different.
As for not being told this did you ask ?
your other opinion is to change your new Wi-Fi name to your old Wi-Fi name and also change the new passcode to your old passcode. You’ll need to login to your router as admin in order to do this. By doing this all your devices will just connect as they recognise the Wi-Fi name and the passcode is correct for them to just connect to your new router.
