trying to get access token using sharepoint onpremise api but getting error in first step

Hi Jerror,

If you are getting the "401 Unauthorized" error, you can try:

1. Check if the owner account has the necessary permissions:
- Make sure that the owner account used for authentication has the appropriate permissions to access the SharePoint resources and perform the desired API actions.
- Verify that the owner account has full control (or the required permissions)

2.Ensure the SharePoint on-premises environment is configured for OAuth:

- Verify that the SharePoint 2016 on-premises environment has been properly configured to support OAuth authentication.

3. Confirm the URL and parameters:
- Double-check the URL you are using to request the access token and ensure it is correctly formatted and matches the SharePoint on-premises environment.
- Verify that all required parameters, such as client_id, redirect_uri, and other necessary parameters, are included and correctly specified in the request URL.

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Kindest regards

Leon Pavesic