Is it possible to access user's OneDrive using MSAL app only authentication for SPOnline REST API?

Question

Hi,

I'm trying to access personal path to user's OneDrive using MSAL authorization and app only (App registration) permissions with SPOnline REST API.
Example personal path:

https://{tenant_name}/personal/{user_UPN}

I have App registration configured for my tenant with Application permissions with Sites.FullControl.All permissions that suppose to give my app full control to all site collections (so I assume OneDrive personal paths as well):

But when I try to access the personal path, I get this error:

The remote server returned an error: (401) Unauthorized.

The code I use is:

 ClientContext ctx = new ClientContext(webFullUrl);  
 ctx.ExecutingWebRequest += (s, e) =>  
 {  
         e.WebRequestExecutor.RequestHeaders["Authorization"] = "Bearer " + userAccessToken;  
 };  
  
 using (ctx)  
 {  
         //Get context web  
         Web web = ctx.Web;  
         ctx.Load(  
                 web,  
                 w => w.EffectiveBasePermissions,  
                 w => w.CurrentUser);  
  
         //Get sp list";  
         List list = web.Lists.GetById(listId); //listId received other way  
         ctx.Load(list);  
         ctx.Load(list.Fields);  
         ctx.Load(list.UserCustomActions);  
         ctx.ExecuteQuery(); //**HERE I GET 401 ERROR when I try for OneDrive file (personal drive), for other sites it works fine!**  
 }  

Is it possible to access OneDrive personal path this way?

BR,
Adam

Answer 1

Hi @AdamMiosz-6301
Per my reearch, rest api to get list and listitems doesn't support personal account

So we are unable to access OneDrive personal path by rest api.
Here is the document for more details
https://learn.microsoft.com/en-us/onedrive/developer/rest-api/api/list_get?view=odsp-graph-online
https://learn.microsoft.com/en-us/onedrive/developer/rest-api/api/listitem_get?view=odsp-graph-online

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