A way to sign in using a short-lived code sent by email. B2B guests fall back on it when no other sign-in route works, and it is turned on by default.
Read more: Microsoft Learn
In the Ultra Transcenders books
Each book explains Email one-time passcode in context, with comparison tables and the common traps.
Terms in this definition
- B2B
Business-to-business features in Microsoft Entra External ID for working alongside partner organisations. Direct connect lets people share Teams channels with no guest account needed, whereas collaboration brings partners into your tenant as guests.