best response confirmed by sarawin kumar k (New Contributor)
Solution

@sarawin kumar k 

 

Do you called the graph api endpoint that ends with /content?.

 

For example:

GET /groups/{group-id}/drive/items/{item-id}/content

 

Refer below thread to know more details about how to download SharePoint file.

https://docs.microsoft.com/en-us/graph/api/driveitem-get-content?view=graph-rest-1.0&tabs=cs

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