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).
When I went to register (21) was greyed out and in parenthesis. When I tired entering a serial number beginning with 21 I could not register the products. I had to drop the numbers to successfully register.
I checked mine and still no Tidal voucher listed on the account, it’s ok though it’s not the end of the world just thought I’d test it out.
I had problems registering my 6000s as well during the week. My mixer went on fine. I did contact customer support who said I shouldn’t be registering them? Bit weird I replied and said that’s not what the manuals say, haven’t heard back yet.
I have since tried again and the 6000s went on fine. However, as stated still no Tidal voucher.
Like I said I’m more worried about the jog wheel issue than the free Tidal trial. Hopefully, these bugs and glitches will get fixed and we will have some feedback Monday.
Thanks again for your messages on this much appreciated.