The AccountOU optionally specifies the pointer to a constant null-terminated character string that contains the RFC 1779 ...

The AccountOU optionally specifies the pointer to a constant null-terminated character string that contains the RFC 1779 format name of the organizational unit (OU) for the computer account. If you specify this parameter, the string must contain a full path, for example, OU=testOU, DC=domain, DC=Domain,DC=com. Otherwise, this parameter must be NULL.