Why is my 2FA code not working?

A 2FA code may fail for several common reasons. The most common one is an incorrect or incomplete secret key. TOTP codes are calculated from the secret key and the current time. If even one character is missing, an extra space is included, or the wrong key is used, the generated code will be different.

Another common reason is that the code has expired. Most TOTP codes refresh every 30 seconds. Some platforms allow a small time window, but not all services are tolerant. It is best to submit the code immediately after it is generated.

Time mismatch can also cause invalid codes. TOTP depends on the current time, so if your phone, computer, server, or browser environment has an inaccurate time setting, the generated code may not match the platform’s expected code. Enable automatic time synchronization and try again.

You may also be using the code for the wrong account or platform. If you have multiple Google, Telegram, GitHub, or exchange accounts, make sure the secret key belongs to the account you are trying to log in to.

A good troubleshooting order is: copy the secret key again, remove extra spaces and line breaks, wait for a new code to refresh, check automatic time sync, confirm the correct account and platform, and rebind 2FA if the problem continues.