Ok. I agree. Thanks for explaining. As you reference in that 2FA when 'unlocking", since there is no auto-logout feature (yet), the only way to ever re-prompt for 2FA is to always be sure to manually logout of the mobile app after every use. Though I disagree with the response that auto-logout is a similar feature request, because that will enforce having to use a long password for every app use.
So to clarify, this feature request, to expand on the previous request, is to add an “Unlock with 2FA” option in addition to the existing “Unlock with Touch ID”, and/or “Unlock with PIN code” security options. Ideally allowing a combination of security e.g. PIN + 2FA without enforcing use of a long password to unlock.
That is my experience with LastPass, though there was a 1-2 year period where they stopped prompting on unlock, it is prompting in the latest version.