Error Using REST API to Retrieve SharePoint content

I am developing a rather simple application that retrieves files from SharePoint using the REST Office 365 API. This is a batch job running in the background with no user interface so the following simple 2-step flow is what I'm doing:
(1) Requesting an Access Token from Azure AD (supplying client ID, client secret, resource, and grant_type=client_credentials)
(2) Invoke the SharePoint API (https://{base url}/_api/v1.0/Files) using the "Authorization: Bearer <access_token>" as a request header .
That process seems pretty straightforward and sounds simple but I keep getting the following error :
401 Unauthorized
x-ms-diagnostics: 3001000;reason="There has been an error authenticating the request.";category="invalid_client"
Any idea what the problem is and how this can be resolved ? I have been stuck on this for days now. I would REALLY appreciate somebody's help with this. Thanks.
- CW

Hi,
According to the error message, the issue is related to Office 365 Rest API authentication.
I suggest you can check the detailed web request using Fiddler to check the access token is valid in the request.
Here are detailed articles for your reference:
Files REST operations
Remote authentication in SharePoint Online
Fiddler
Thanks
Best Regards
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Jerry Guo
TechNet Community Support

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