Benefits aren’t my strong suit but I do know that employers must require employees to take EI and CPP benefits. And I don’t know of any law–in BC or any other part of Canada–that would ban employers from requiring employees to enroll in other benefits programs provided by the company. Theoretically, that may be an intrusion, especially if the employee is paying some or all of the premiums. But I can’t think of any law that mandatory enrollment would violate.
Hope that helps. And if any of the HRI users reading this knows of a law barring mandatory enrollment, please let me know. Glenn   glennd@bongarde.com