Subform recording data but not sending via email

Subform recording data but not sending via email

Hi, 

I have a form set up for inspections and I have added a SubForm for logging faults. This Sub Form when completed on its own will automatically send an email notification to the pre-set addresses however when used as a SubForm in another Form it does not send. The data is recorded on the Records but no onward notification as set up on the stand alone? 

Can anyone advise?

Thanks

James