link - docs.microsoft.com/en-us/office/dev/add-ins/testing/troubleshoot-manifest
Office Add-in Validator
This is a command line tool that can be used to validate your manifest.
This uses the same validation service that the Office Store uses.
The feedback you get is the same you would get from submitting
A local copy of the validator is installed when you install Yo Office
Or alternatively just install the validator
npm install -g office-addin-validator
If the script has been defined in the webpack.config.js file
npm run validate manifest.xml
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