The process was handled by the Identity Management team that manages the SSO. The basic steps were to gradually enable/require MFA for different types of users (first IT staff, then faculty, then students), and initially only on specific services (the SIS, then email, then Canvas, then everything else), so that almost everyone had experience using MFA on at least one other service before it was required on Canvas.
Because of that, there wasn't a whole lot of Canvas-specific communication beyond the usual channels like campus newsletters and Canvas announcements. The Help Desk also had to be brought up to speed helping people get MFA set up and troubleshooting.
There were a couple of gotcha's, of course, like students who got used to using fingerprint scanners on their MacBooks to approve MFA and finding that that method didn't work with LockDown Browser, so they needed a second device.
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