Ah! It's just clicked in my head what has happened.
You said in your OP you had ceased the line. So AA closed your account and gave Openreach a
Cease order, which on ADSLx so probably also on FTTC takes a while to be actioned. It just has been.
That would explain sync but no authentication.
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 - 72382/13812Kbps @ 600m. BQMs -
IPv4 &
IPv6
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If you never think of anything off the wall, you'll never think of anything original.