Changes to Get the sign-in options.

added the optional property field to the response with the 400 status

added the optional property field to the response with the 401 status

added the optional property field to the response with the 413 status

added the optional property field to the response with the 415 status

added the optional property field to the response with the 500 status

added the optional property field to the response with the 503 status

added the optional property reason to the response with the 400 status

added the optional property reason to the response with the 401 status

added the optional property reason to the response with the 413 status

added the optional property reason to the response with the 415 status

added the optional property reason to the response with the 500 status

added the optional property reason to the response with the 503 status

endpoint added