Lacerte DiagnosticsModerator5 years agoNov 21, 2020 12:00 AM UTC4050 replies13 viewsThe following diagnostic is generating: Form 2555 - W-2 # {PrefixNum} : Employer identification number (EIN) is invalid. A valid EIN is a nine digit number, is all numerics, cannot equal NONE or the taxpayer's or spouse's SSN, and must not be all 0s or 9s. Solution: Help Article Individual Federal