Switch from U2F API to Web Authentication API
This morning, when signing in to the Tails GitLab, my Chromium-based browser (Brave) presented me with a dialog warning that "This site won't be able to use the U2F API after February 2022." This is related to Google's Intent to Deprecate and Remove: U2F API (Cryptotoken).
NB: I use YubiKeys for my second authentication factor.
It's worth pointing out that "support for WebAuthn is under development and not ready for production use."