background:

i had a AXE75/axe5400 tri-band easy mesh router set up (with externders, etc.), i updated my ISP modem and had a 2.5g port available, so i updated to a router supporting easymesh and 2.5g (the BE3600/be230).  Trying to upgrade and keep the configurations was quite painful, essentually ended up with installing new router, and h/w resetting old router to get it to be found by binding process so it can be used as a satelite node.   (side note: a FAQ on how to do a router swap would be nice)

i'm manually re-entering data (client names, VPN, dhcp reservations, subnetting, etc). I've seemed to have lost 6ghz band on the old tri-band router?  

Question:
i've gotten to DDNS, and it won't let me pick my name as it's already registered.  (It doesn't show on my current ddns screen, and i can select another name).

I've checked using nslookup, and the ddns it's still pointing at my public ip,  so i'm guessing the old router is holding it even though it's in satalite mode.   I would expect it would be tied to my tp-link id,    As the old router is now a satelite, it no longer is individually configurable (as far as i can tell).