Amr_values is an OPTIONAL parameter as a Space-separated string that in the Authorization Request specifying the values that the Authorization Server is being requested to use for processing this Authentication Request, with the values appearing in order of preference.

Amr_values SHOULD use the Authentication Method Reference Values defined in the IANA.OAuth.Parameters established in RFC 6749.

The actual values used by the Authorization Server is returned within the Identity Token within the amr parameter.

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