Submit a Support Ticket Thank you for choosing Lifesize! Thank you for choosing Lifesize! Please submit the serial number or license key of the affected Lifesize product. * Serial Number Many customers have told us our email addresses sometimes get caught in their spam folders. To prevent this, please whitelist the following email addresses: email@example.com and firstname.lastname@example.org. If you’re having trouble with serial number or license key validation and are unable to open a ticket, we want to help. Please email us, or call us at +1-512-347-9300, 1-877-LIFESIZE or one of our global phone numbers.