Conditional Access authentication strengths for guests

Source history: extracted from the page's source file at a commit; shared includes are not expanded

Settings and overrides named on this page

Registry values, policies and cmdlets the source mentions, with the dated steps that name them. Read the source for the values to set.

• WS-Fed

Requirements, exceptions and scope

• OverviewRequirementExceptionRecommendation3 conditions3 passages
  WS-Fed
• Configure cross-tenant access settings to trust MFARequirement1 condition1 passage
• Create a Conditional Access policyExceptionRecommendation2 conditions2 passages
• Related contentException1 condition1 passage

Extracted automatically from Microsoft's wording. Confirm dates, conditions and whether they apply to you in the source before acting; a month or quarter is a window, not a day.

How this timeline changed

Changes between ChangeIntel's readings of the page, between commits of its source file where Microsoft publishes it, in Internet Archive copies of pages that keep no other history, and entries from Microsoft's own change log (dated as Microsoft dates them). Edits between readings that neither records are unknown.

1. 25 Mar 2026
   Exception added OverviewMicrosoft's source, commit cf00514
2. 25 Mar 2026
   No longer on the page Require multifactor authentication strength for external usersMicrosoft's source, commit cf00514
3. 25 Mar 2026
   Recommendation added OverviewMicrosoft's source, commit cf00514
4. 25 Mar 2026
   No longer on the page Require multifactor authentication strength for external usersMicrosoft's source, commit cf00514
5. 25 Mar 2026
   Requirement added OverviewMicrosoft's source, commit cf00514
6. 25 Mar 2026
   No longer on the page Require multifactor authentication strength for external usersMicrosoft's source, commit cf00514
7. 23 Mar 2026
   No longer on the page Create a Conditional Access policyMicrosoft's source, commit 7c2c3e4
8. 1 Apr 2025
   No longer on the page Create a Conditional Access policyMicrosoft's source, commit 7743ece
9. 1 Mar 2025
   Recommendation added Create a Conditional Access policyMicrosoft's source, commit 3012754
10. 1 Mar 2025
    No longer on the page Create a Conditional Access policyMicrosoft's source, commit 3012754
11. 10 Oct 2024
    Recommendation added Create a Conditional Access policyMicrosoft's source, commit 7d30e57
12. 1 Oct 2024
    No longer on the page Require multifactor authentication for external usersMicrosoft's source, commit bb0b145