Update region codes and names in MFA Opt-In documentation

[nuviedo]

Updates to the latest country codes subject to the opt-in policy for Workforce tenants.

[nuviedo]

@microsoft-github-policy-service agree company="Microsoft"

[nuviedo]

#sign-off

[prmerger-automator]

Invalid command: '#sign-off'. Only the assigned author of one or more file in this PR can sign off. @Justinha

[prmerger-automator]

@nuviedo : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit b71e968:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/identity/authentication/concept-mfa-regional-opt-in.md	💡Suggestion		Details

docs/identity/authentication/concept-mfa-regional-opt-in.md

• Line 78, Column 1: [Suggestion: table-syntax-invalid - See documentation] Table syntax is invalid. Ensure your table includes a header and is surrounded by empty lines.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

[prmerger-automator]

PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.

[learn-build-service-prod]

Learn Build status updates of commit 8735544:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/identity/authentication/concept-mfa-regional-opt-in.md	✅Succeeded

For more details, please refer to the build report.

[prmerger-automator]

PRMerger Results

Issue	Description
File Change Percent	This PR contains file(s) with more than 30% file change.

[Copilot]

Pull Request Overview

This PR updates the MFA regional opt-in documentation to reflect the latest country codes and naming conventions for regions subject to the opt-in policy for Workforce tenants. The changes standardize country names, consolidate duplicate entries, and ensure the list is current and properly formatted.

Key changes:

• Removed countries that are no longer subject to the opt-in policy (e.g., Austria, Brazil, China, Colombia, Finland, Germany, India, Italy, Japan, etc.)
• Updated country names to use standardized naming conventions (e.g., "Hong Kong SAR" → "Hong Kong", "Curaçao" → "Curacao, Netherlands Antilles")
• Consolidated duplicate entries and reorganized the list with proper line numbering

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[v-dirichards]

@Justinha

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team