Interesting since the site says: Yes, kids 4 and under receive free lift access with the 4 and Under Epic Pass. The 4 and Under Epic Pass is available starting Labor Day Weekend prior to the ski season. To be eligible for this pass, the child must be 4 years old or under at time of purchase. If the child turns 5 after Labor Day through the ski season, they are still eligible for this pass. To receive this pass, you must redeem at any Vail Resorts owned-and-operated ticket window. The child must be accompanied by an adult on-mountain at all times.
Please contact the Season Pass Call Center at (970) 754-0005 or email email@example.com to have a 4 and Under Epic Pass shipped to you. To receive same-day lift access, please visit a ticket window.
Interesting that is a different number, I will give it a call.