The 2019-09 version of the Cloud Orchestrator changed REST API Authentication. It no longer uses Basic Authentication.
From the post you made ^^^^^ 2 hours ago, I think you are trying to use Cloud Orchestrator. If you have an On-Premises Installation of Orchestrator, Basic Authentication still works.
There are a couple of resources to help you with the Cloud Orchestrator REST API Authentication:
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Official Documentation found at: About OData and References . See the section at the bottom of the ToC, “Consuming Cloud API”
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HareeshMR has a blog post on forum.uipath.com: Steps for authenticating and using Orchestrator cloud API
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I have written the Definitive Guide to Cloud Orchestrator REST API Authentication which you can find here: The Definitive Guide to UiPath Cloud Orchestrator 2019.9 REST API Authentication. – Deale Tech
Also, the credentials you use for the platform.uipath.com are the credentials you use to login interactively.
Hope this helps.
– Michael.