That message is not from Plusnet. It is a standard one from BT Wholesale when you have not entered the correct login details for your ISP.
As I posted earlier, I suspect you are entering your username incorrectly in the router.
It is not simply your account username. It is in the format:-
[email protected]
Edit: No nots have been harmed in the correction of this post.
My broadband basic info/help site -
www.robertos.me.uk. Domains, site and mail hosting -
Tsohost.
Connection - AAISP Home::1 80/20. 200GB. Sync 01/10/18 - 71908/13506Kbps @ 600m. BQMs -
IPv4 &
IPv6
==================================================
If you never think of anything off the wall, you'll never think of anything original.
Edited by RobertoS (Tue 30-Oct-18 10:04:19)