The "One-Time" in One-Time Password (OTP) refers to the number of times you can use a specific 6-digit passcode to login (one time), not something you only enter once. A new valid password is generated for your account every 30 seconds so that someone can't look over your shoulder and see your 6-digit code, or a "hacker" can't capture what you enter and try to reuse it at a later time. It's purpose is to add a "second factor" in addition to your account password, to make your login more secure. It is usually only implemented for user accounts that have access to data of multiple users, or higher risk data/information - like employee and student data in the case of NCEdCloud.
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