Problem resolved.

I uninstalled FAF Client and Chrome. Upon reinstall of both, the login worked and I am back in.

When I attempt to log into the FAF client I am presented with the option to 'Log in with Browser'. The button/link opens Chrome, and I log in. I then receive the following error in Chrome:

Access user.faforever.com was denied
You don't have authorization to view this page.
HTTP ERROR 403

I am on v2023.2.0 and I have previously re-installed the client.

Any help or guidance would be appreciated. While I wait, I am going to uninstall completely and reinstall from a freshly downloaded installer.