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How do I debug an Outlook web add-in?

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Graham Keellings
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I am trying to develop my first Outlook web add-in, by following this guide https://docs.microsoft.com/en-us/outlook/add-ins/addin-tutorial aiming eventually to add a button to the "compose" dialog that displays a pane with an AngularJs app.

 

I managed to add the add-in to the message read command surface. Although I did have make some mistakes with the manifest & was surprised that the Yeoman validate-office-addin said that my manifest was valid, but I could not add it to Outlook, owing to errors. Is there a better validator?

 

Next, I moved my button to the message compose surface & when I click it, the pane appears with the correct title, but a continuous "loading" image.

 

Question, how do I debug a custom web add-in which I have added into https://outlook.office.com ?

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Note that I am not, so far, using Visual Studio
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