Please contact the MSKCC portal helpdesk for further support. ×. For Questions about MyMSK. We're here to help! If you need some help about MyMSK, you can use this link to email the MyMSK Help Desk, or email us at mymsk@mskcc.org. You can also call the MyMSK Help Desk toll free at 646-227-2593 in New York City, or call toll free outside New ....