Since I posted my original question, I've received additional info from Intuit which indicates that certificates are emailed to the address used when registering for the class, typically within 7-14 business days.  If the certificates do not appear on schedule, then Lacerte recommends that the attendee contact Lacerte using one of the following options.

ProConnect Tax Online - customer support chat team (https://proconnect.intuit.com/shared/chat/inin_prechat/?group=ito-care)
Lacerte - 800-933-9999
ProSeries - 800-434-6818