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lowOfficeotherlink_discovery · Sep 16, 2026

[Docs] "We can't open this add-in from localhost" when loading an Office Add-in or using Fiddler

A known issue with Office Add-ins prevents opening them from localhost, affecting developers working on add-in projects.

“Linked from "Tutorial: Build a message compose Outlook add-in - Office Add-ins": "We can't open this add-in from localhost" when loading an Office Add-in or using Fiddler”
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Audience
developer
Environment
cloudon_premises
Classification confidence: 85%
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[Docs] "We can't open this add-in from localhost" when loading an Office Add-in or using Fiddler | 365Forge