401
Easy Fix
ADP · Payroll & HR Platform
ADP authentication failed.
Quick Answer
Error code 401 on your ADP Payroll & HR Platform means: ADP authentication failed.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Reauthenticate and complete MFA.
2
Reset password if needed.
3
Clear session cache.
4
Retry login from trusted device.
5
Contact admin if account is locked.
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Related Error Codes