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Two-factor authentication adds a 6-digit code from an authenticator app to your password at sign-in. It's optional but strongly recommended, especially for managers.
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Settings โ Security โ Set up MFA (/mfa/enroll). At sign-in, the code prompt is /mfa/verify.
After your password, the Two-factor authentication screen shows six boxes. Type or paste the code โ it submits itself on the sixth digit. A wrong code clears the boxes ("That code didn't work. Enter the current 6-digit code from your authenticator app."); try again with a fresh code. Too many wrong codes in a row shows "Too many attempts. Please wait a minute and try again."
Settings โ Security โ trash icon โ Remove factor. Removing a factor signs you out of all devices; sign back in and re-enroll if you wanted to move to a new device or app.
โ Sales Tax Center User Guide
Work instruction: WI-8 ยท Manage your account, team, security and billing