/AllowDomainControllerReinstall:{Yes | | NoAndNoPromptEither} Specifies whether to continue installing this domain controller ...

/AllowDomainControllerReinstall:{Yes |  | NoAndNoPromptEither}
Specifies whether to continue installing this domain controller despite that a domain controller account with the same name is detected. Specify Yes only if you are sure that the account is no longer in use.