3807391 - OpenAPI: Unauthorized error when generating bearer token for API

I'm receiving unauthorized / unauthorized request when attempting to generate a bearer token.

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SAP Ariba Procurement, cloud edition all versions ; SAP Ariba Sourcing, cloud edition all versions ; SAP Ariba Supplier Lifecycle and Performance all versions ; SAP Business Network for Procurement and SAP Business Network for Supply Chain all versions

unauthorized, unauthorized request, bearer token, OAuth, OAuth2, token endpoint, oauth/token, Basic Authorization, Base64, client_credentials, application key, OAuth secret, Ariba API, SCIM, user and group , KBA , BNS-ARI-CP-API-CP , Core Procurement REST API , BNS-ARI-SS-API , Strategic Sourcing - REST API , BNS-ARI-RSK-API , Supplier Risk API , BNS-ARI-SS-API-OPR , Strategic Sourcing - Operational Reporting API , BNS-ARI-ANL-API , Analytical Reporting - REST API , BNS-ARI-SC-API , Strategic Contracts - REST API , BNS-ARI-SLP-API , Supplier Lifecycle & Performance - Open API , SBN-AN-API-SUP , SAP Business Network REST APIs - Suppliers , BNS-ARI-PAS-API-PTL , API Developer Portal , BNS-ARI-PAS-API , API Portal & Platform , BNS-ARI-CP-API-OR , Operational Reporting API , BNS-ARI-CP-API , Procurement REST APIs , SBN-AN-API-BUY , SAP Business Network REST APIs - Buyers , BNS-ARI-SC-API-OPR , API Reporting for Strategic Contracts , Problem