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SharePoint Online API POST


Am using the Invoke Web Service in the Process Designer to try obtain the access token to for SharePoint Online

I'm using the following article as a guide:

I've tested the process in PostMan and it works.

However when I use the "Invoke Web Service" in WinAutomation, I receive the following error:

{"error":"invalid_request","error_description":"AADSTS900144: The request body must contain the following parameter: 'grant_type'.\r\nTrace ID: 8555ebc5-03cb-4274-9137-3861e00a5f00\r\nCorrelation ID: 95064861-b87a-44c4-bc4c-1c2aa06433ae\r\nTimestamp: 2020-05-25 21:07:02Z","error_codes":[900144],"timestamp":"2020-05-25 21:07:02Z","trace_id":"8555ebc5-03cb-4274-9137-3861e00a5f00","correlation_id":"95064861-b87a-44c4-bc4c-1c2aa06433ae","error_uri":""}

I've tried various formats for the Request Body, but keeping getting the above error.

Could anyone please advise the format of the Request Body?

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