Kde Neon website has a link to https://webchat.kde.org/#/room/#kde-neon-users:kde.org for support.
I've tried registering there but none of the domain names for the email addresses I've tried were whitelisted, total bogus. Meaning no chat support for me.
I've tried both gmail.com and freezingmoon.org email address and got "Your email domain is not authorized to register on this server" errors for both.
Perhaps someone should check that the chat registration isn't actually borked, denying all email addresses...

It does not work for me also. I have a KDE bugzilla account, a KDE identity account, and neither are accepted.
It also gives "Your email domain is not authorized to register on this server" error for my gmail account.