Update security-cross-tenant-communication.md

[advaitha-karthikeyan]

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[prmerger-automator]

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

[learn-build-service-prod]

Learn Build status updates of commit aef3893:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/security/security-cross-tenant-communication.md	✅Succeeded

For more details, please refer to the build report.

[v-dirichards]

@msmimart

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

[Copilot]

Pull Request Overview

This PR adds important prerequisite information for cross-tenant communication setup by introducing a note about the Microsoft.Fabric resource provider requirement, and fixes trailing whitespace in the documentation.

• Added a NOTE callout documenting the Microsoft.Fabric resource provider prerequisite for both tenants
• Removed trailing whitespace from line 24

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[msmimart]

#sign-off

[ktoliver]

Due to the upcoming conference, all merging and publishing is on hold until the morning of November 18, 2025.

This PR is ready for merge on November 18, 2025.

#label: "event-triaged-to-10AM"
#label: "missed-content-complete"
#label: “ready-to-merge” 

[prmerger-automator]

Are you trying to add/remove a custom label? The syntax for that is #label:"your label".