OTP generates a verification code using Google Authenticator.
OTP is mainly based on the time difference as a server and password generator synchronization conditions.
When needed, use the password generator to generate a one-time password to enhance security.
Installation and setting method is as follows:
Android users:
https://support.google.com/accounts/answer/1066447?co=GENIE.Platform%3DAndroid&hl=en&oco=0
iPhone / iPad users:
https://support.google.com/accounts/answer/1066447?co=GENIE.Platform%3DiOS&hl=en&oco=0
Note: Use Google Authenticator. Your system's time zone, date, and time must be correct.