One-time passcode authentication for B2B guest users - Microsoft Entra External ID

How to use Email one-time passcode to authenticate B2B guest users without the need for a Microsoft account.

Email One-time Passcode Archives - Office 365 for IT Pros

Cross-tenant access overview - Microsoft Entra External ID

Govern access for external users in entitlement management

Authentication and Conditional Access for B2B users - Microsoft

Properties of a B2B guest user - Microsoft Entra External ID

Tutorial - multifactor authentication for B2B - Microsoft Entra

Properties of a B2B guest user - Microsoft Entra External ID

Mandatory one-time password is coming, are you ready? – Set

Azure AD B2B Collaboration Archives - Office 365 for IT Pros

Govern access for external users in entitlement management

Grant B2B users access to your on-premises apps - Microsoft Entra

Quickstart: Add a guest user and send an invitation - Microsoft