I'm in the process of buying a second-hand Komplete Kontrol S49 mk2, but when I went to pick it up the NI website wouldn't accept the Transfer ID.
We did everything right and the seller actually requested the transfer ID back on November 3. He forwarded the email with the Transfer ID today while I was with him, but the transfer form at https://www.native-instruments.com/en/my-account/license-transfer/complete-transfer/ keeps rejecting it with the message "Transfer token not valid". We tried copying and pasting a few times, and also painstakingly typing it in precisely, but still the same thing.
After this I thought that maybe the Transfer ID had expired since it was requested 5 days ago. However, according to this support article: https://support.native-instruments.com/hc/en-us/articles/360000148717-My-License-Transfer-ID-is-Invalid, Transfer IDs never expire.
I'm convinced the system is broken, because we even logged into his NI account and there are no transfers listed at all in the Ready for Transfer page (https://www.native-instruments.com/en/my-account/license-transfer/my-transfers/). Also, the product (KOMPLETE KONTROL S49 MK2 HW) is still appearing in his account, but the status is "Not transferable". In fact, everything listed in his account is Not transferable. The products in the list also include "KOMPLETE 13 SELECT for S-SERIES", "Maschine 2 Essentials Application for S-SERIES Keyboards" and a bunch of other stuff.
We're completely stuck with this and can't do anything about it. We can't cancel the transfer to do it again from scratch because it doesn't even appear in active transfers, and everything is set to Not transferable anyway.
It's frustrating because we did everything we were supposed to do and I ended up wasting 3 hours and $25 on toll fees to drive over to his place only to find that the system wouldn't let us proceed.
We've logged a support request under his account, but who knows when that will be responded to and he's about to move interstate the day after tomorrow, which is why he's selling it. So if we don't sort it out tomorrow we have a problem.