Array of values, which will be used inside ID Token acr
claim sent inside the claims
parameter to Keycloak server during login.
Values should correspond to the ACR levels defined in the ACR to Loa mapping for realm or client or to the numbers (levels) inside defined
Keycloak authentication flow. See section 5.5.1 of OIDC 1.0 specification for the details.
This parameter specifies if ACR claims is considered essential or not.