Third Part Application Cannot Use 3rd Party Certificate - ldaps - for child domain?

We recently installed certificates on our parent domain controller - and implemented ldaps?  It works for the parent domain.  It also seems to work with ldp tool toward child domain authentication.  However, the whole purpose was for use with a third party application - Team Dynamix.  We absolutely can't get it to work - any ideas appreciated?  Is it 'normal' to expect  third party applications to work querying through through the parent domain?

Thanks.