I have a Sharepoint domain domain.sharepoint.com. I want to add a second, separate environment (domaindev.sharepoint.com) for our SharePoint Developer to play in without breaking the main site. I currently own domaindev.com. I have added domaindev.com to Office365, but when I attempt to create a site collection in Sharepoint Online, domaindev.sharepoint.com is not an option. Does anyone have any ideas?