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I am developing a native app (WinInet/C++) and after completing OAuth2 as described here and getting auth token, try to send any request to my SharePoint but get 401.

The site is SharePoint online (like https://mycompany-my.sharepoint.com), my app is registered in Azure AD.

401 response asks for X-Forms auth in the header, while I need OAuth since it has long-living token, allows several users being logged-in on the same application, gives more control on revocation and refreshing of the token.

enter image description here

  • Did you gave proper App Permission – Milind Aug 31 '19 at 16:31
  • If you mean in Azure portal, yes, it's set to full access (set it for testing purpose). But I didn't register the app on SharePoint server specifically since expected usage is to run on customer's servers where I cannot register my app on every server. – andrii Sep 1 '19 at 18:25
  • No, I mean Azure API. If you are going use graph API then you need to register Azure API in azure active directory blade – Milind Sep 1 '19 at 18:59
  • I am not using graph API - I use some mix of CSOM and other older API since some customers still have old SP on-premise/local versions and I wouldn't like to have several implementations - old and new-like. I didn't really get what is registering Azure API in AAD blad :( How can I register API? In general, I followed steps described by the link in my question – andrii Sep 1 '19 at 20:03
  • Firstly, The site is SharePoint online (like mycompany-my.sharepoint.com), my app is registered in Azure AD. It's a Onedrive URL, not a SharePoint site URL in Office 365. – Utkarsh Dubey Sep 11 '19 at 10:07
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I have put it as answer as in comments I cannot add image.

Now over to your question, Documentation link which you gave clearly mention that you to register app on Azure. Please read documentation properly. If you can't then let me know I will come on chat and help you out.enter image description here

  • I have done it. If didn't I wouldn't be able to get auth token. But as I wrote, I do get auth token but it does not work with SP server – andrii Sep 3 '19 at 11:09
  • go to jwt.ms and past your auth token and send us screen shot of the result – Milind Sep 3 '19 at 11:20
  • sorry, "send us" - whom "us"? cannot put screenshot here – andrii Sep 3 '19 at 21:25
  • Us me and other people who can help. To put screen shot edit your original question with screen shot – Milind Sep 4 '19 at 6:43
  • Did you resolve the issue – Milind Sep 5 '19 at 3:33

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