To be fair, some languages outside of English reserve “it” (or the equivalent 3rd person neuter pronoun) for “non-living” things. For people whose native language is one of those languages, calling an animal “it” may seem a bit too harsh even while speaking English.
To be fair, Fedora switching to something as default isn’t a good sign that you should start using it. I do agree, though, btrfs has come far enough to be a default choice for most people.
Are you talking about 2FA login for your own user account or U2F/PIV/WebAuthn in your browser? The latter seems to work out of the box on any non-snap or flatpak browser, but the former needs a bit more setup as that is not a standard feature in Ubuntu yet. I recommend using ykman and yubico-piv-tool for configuring yubikeys in linux, but Yubico also provides a GUI application on their website
Clear the app cache, that did it for me.
If it doesn’t work, clear the data too.
At least you finally cleaned up that Downloads directory