In the onboarding video, there was an invitation to community Slack on https://mendixcommunity.slack.com/. When I enter my e-mail (with which I am logged in here on Menix.com), I receive an email that says "It looks like there isn’t an account on Mendix Community tied to this email address." I also tried sign up which allows only emails with domains mendix.com, jhu.edu. asml.com and says "Contact the workspace administrator".