I can't sign in to Synology Account using 2-factor ...
kb.synology.com › en-global › DSMDec 22, 2021 · 1. Sign in to your Synology Account When asked for the two-factor authentication, continue to sign in to your Synology Account through one of the following methods: Use a Recovery Code After entering your password, click Try another method > Enter your recovery code. Use the recovery code generated at the time you set up two-factor authentication.