[mhurron]

Or you don't have employees using their personal email to open corporate accounts.

Still on Amazon to clearly tell people it is this way so they can properly plan for it, but employee's email addresses really shouldn't be used for the root account.

[ksenzee]

That’s not what’s being described here. What OP described is the much more common situation where employees use a personal phone for MFA. Sure, some places issue hardware dongles and disallow authenticator apps on your personal phone, but IME most places default to just having people use their phone.