When I first signed up for Business Broadband (many years ago!) I was given a username/password in the format of A123456@hg78.btclick.com and which I've used on all modems/routers connected to my line since, though various package and line upgrades too.
My latest BT Business Smart Hub comes pre-configured with with the generic username and assoicated password green-light@service.btclick.com and connects fine as-is. Presumably any account authentication takes place at the line level.
My question: what's the purpose / value of using an indervidual username/password? Should this still be used, or the generic one instead?
Thanks in advance.