Service Layer Single Sign On (SSO) example or tutorial

POST https://localhost:50000/b1s/v1/Login { "CompanyDB": "DEMO_US", "Password": "MyPass", "UserName": "demo" } Error message: { "error": { "code": 401, "message": { "lang": "en-us", "value": "Internal error: Get entree token error,{\"error\":\"invalid_grant\",\"error_description\":\"Invalid idiosyncratic credentials\"}." } } }

Additionally, the Service Layer PDF manual is precise generic connected however to link via SSO and haven't recovered solutions successful different forums/SAP docs. 

Thanks