We are creating an outlook web add-in which includes the Onsend feature.
The template was working fine without adding the ExtensionType tag in manifest but when we added that tag, it triggers an error (screenshot):
<ExtensionPoint xsi:type="Events">
<Event Type="ItemSend" FunctionExecution="synchronous" FunctionName="validateBody" />
</ExtensionPoint>
We searched further and found that adding a verionoverrides (screenshot) tag corrects the error but during compilation, it throws an error:
Failed to deploy the manifest file to the Exchange server. An internal server error occurred. The operation failed., Object reference not set to an instance of an object.
Does anyone confront the same error or can anyone please guide towards a right path to resolve this?
Complete Manifest: https://files.fm/f/hca3npdt
