Hi,
What i understand from your question is that you are having error (can not find alias) while calling factory.conferencecreate method, for that an alias could be meant for scheduling via TMS , one wouldn't want anyone to connect using that alias into a conference early. If you limit the use of a template, then one could prevent someone from starting a conference, ie: a conference that might be configured to dial out to many other participants or recording servers for example via Conductor's auto dialed participants feature. These two features can be used separately or together to create combinations of what is allowed or not allowed via an alias or template.
Reference - https://communities.cisco.com/message/148621
Thanks and Regards,
Geevarghese