It seems that Manjaro’s 5.0.0-1 version of the
yubikey-manager , with the effect of not letting me use it to sign in at all the sites I’d set up to use TOTP authentication.
If the previous version (4.0.9-1) were still in the pacman cache, then:
sudo pacman -U /var/cache/pacman/pkg/firefox-64.0.2-1-x86_64.pkg.tar.xz
Regrettably, I had recently cleaned things up and flushed the cache, so I had toof the , then install it:
sudo pacman -U /tmp/yubikey-manager-4.0.9-1-any.pkg.tar.zst loading packages... warning: downgrading package yubikey-manager (5.0.0-1 => 4.0.9-1) resolving dependencies... looking for conflicting packages... Packages (1) yubikey-manager-4.0.9-1 Total Installed Size: 1.11 MiB Net Upgrade Size: -0.13 MiB :: Proceed with installation? [Y/n] Y <<< snippage >>>
Whereupon It Just Worked™ again.
I expect someone more experienced than I will have long since filed a bug report / sent a pull request / whatever, because I have little idea how to do any of that. The next upgrade should work just fine.