Each SSO protocol Avaya Aura® Device Services supports, that is SAML v2.0 and OAuth2 SSO, Device Authorization Flow, and Workspaces SSO, have different set of prerequisites to fulfill. Read the prerequisites corresponding to the SSO flow you are implementing before configuring Avaya Aura® Device Services.
Important:
You can only enable OAuth when you are installing or upgrading Avaya Aura® Device Services. You cannot enable OAuth at a later point.