Tip
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There's no direct method to determine the Outlook profile GUID and mail account encoding used in the bundle.js file path. The most effective approach to locate your add-in's bundle.js file is to manually inspect each folder until you locate the Javascript folder that contains your add-in's ID.
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If the bundle.js file doesn't appear in the Wef folder and your add-in is installed or sideloaded, restart Outlook. Alternatively, remove your add-in from Outlook, then sideload it again.