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Fixing Silent Exclaimer Cloud for Outlook Deployment Failures in Microsoft 365 Integrated Apps

A silent, undocumented failure mode in Microsoft 365 Integrated Apps prevents the Exclaimer Cloud for Outlook add-in from deploying on some tenants, with no error code surfaced anywhere in the UI, PowerShell, or audit logs. This post walks through the API-level diagnostic process that identified the root cause, and the Graph API fix that resolves it.

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