Looks to me like an error with the site config. Notice the statement that serial numbers start with (21) but your SC6000 numbers do not start with (21).
Clearly a job for Denon.
See here too Can't register SC6000M's
Looks to me like an error with the site config. Notice the statement that serial numbers start with (21) but your SC6000 numbers do not start with (21).
Clearly a job for Denon.
See here too Can't register SC6000M's