So after a bit more messing - using virtual machines and TOR circuits, the problem seems to be simply that for whatever reason, when a login is attempted with my everyday browser - Brave - then I never get the NDLP email verification.
However if I try and login from any other machine, the NDLP email arrives within a second. So clearly the email mechanism is working and there is nothing wrong with my registered email address.
(I have now re enabled 2FA 
)
If BitWarden support get back to me I’ll supply what they need. But it’s been 3 days now.
Really I should close this thread and open a new one. But since I have a workaround (my ITIL training kicking in) then I can carry on with my life.
