3368358 - Cloud Integration flow fails with response "422 Unprocessable Entity" from token provider endpoint

Cloud integration flow is built to fetch access token from token provider, but token endpoint answers 422 http code and similar to below response body:

{"detail":[{"loc":["body","username"],"msg":"field required","type":"value_error.missing"},{"loc":["body","password"],"msg":"field required","type":"value_error.missing"}]}

SAP Cloud Integration

{"detail":[{"loc":["body","username"],"msg":"field required","type":"value_error.missing"},{"loc":["body","password"],"msg":"field required","type":"value_error.missing"}]}, 422, http 422, unprocessable, entity, 422 Unprocessable Entity, message header, body, grant_type, password, username, content modifier, Content-Type, application/x-www-form-urlencoded, , KBA , LOD-HCI-PI-CON-HTP , HTTP Adapter , LOD-HCI-PI-WT-IFL , Integration Designer , Problem