Avoid multiple logins is a data security-related upgrade. This feature will reduce risk of unauthorized people accessing other user credentials, with introduction of this feature, a user can have only one live session.
An OTP will be generated as an authenticated process to validate genuineness of current login & on successful OTP authentication user will be allowed to continue and previous session will get terminated.
Please refer to the link for more details.
https://drive.google.com/file/d/1GI0DNQZTo-abfs1JaqrFGpNFaGMH4W6M/view?usp=sharing
