Scenario
External guests join Teams successfully, yet file access through SharePoint links fails under the same collaboration scenario.
Recommended Resolution Path
- Compare app targets and session controls between the Teams and SharePoint policies.
- Check B2B redemption status and whether cross-tenant trust settings changed.
- Review sign-in logs for the exact app and claim that caused denial.
- Align guest collaboration policy intentionally instead of letting apps diverge by accident.
Technician Notes
Document what changed, what confirmed the fix, and whether the issue points to a broader standards gap worth addressing for the client.
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Subjects