Google Workspace (Formerly "G Suite"):

G Suite accounts created before December 2016 have 2-Step Verification turned off by default


Microsoft Office 365:

https://support.microsoft.com/en-us/office/set-up-your-microsoft-365-sign-in-for-multi-factor-authentication-ace1d096-61e5-449b-a875-58eb3d74de14


Okta:

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