Does Oracle support multiple authentication policies?

Summary: Multiple authentication policies for employee versus contingent worker?

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Hello, We are using Financials and Projects. Our current log in screen presents both SSO and ID/Password logins. We would like to change this so that SSO is the only option provided to all employees( with the exception of a small group of admins and individuals who are occasionally and temporarily granted implementer access. These individuals are from partners typically not our company. There is also a desire to implement services procurement and allow non employees(sub contractors to access OTL to log time which would in turn generate check on PO and AP Payment.