When inviting people to share your project in Fusion 360. It would be beneficial to invite by email address OR Autodesk ID name. Part of this is a request from within Autodesk as our usernames are the same as our forums names so customer know right away how to add these users to their projects for technical support.
The byproduct of what we have now is that we are giving out our email address fairly openly which as Fusion 360 grows could result in emails coming in through wrong channels and customers not getting the support that they need.