The documentation for logging in with a temporary One Time Password at
https://support.lastpass.com/home?articleID=2151864851is incomplete.
It says, after entering your email address and a One Time Password, you will be logged in. This is NOT true if you have a Multifactor Authentication (MFA) method enabled, because it will prompt for the MFA passcode before you are logged in. The documentation should make this clear. As written, it seems to indicate that OTPs can be used to bypass MFA.