U2F deprecation in Chrome and Edge
Chrome deprecates U2F support in 2022 and GitLab still uses the old U2F API (warning is shown in Chrome) instead of the WebAuthn API. All instance users (at least using Chrome Web Browser) which have enabled Two-Factor-Authentication with a security key will be locked out of their account after February 2022. Google will remove U2F support at this date.
Recommendation: Switch to WebAuthn before this date.
For reference:
Edited by Sebi2020