@Jaime_Villegas
Shuji at Zwift HQ here.
Your KICKR Core v2 should have come with different adapter pieces.
Are you using item 7, the drive side spin cap? That is still needed in addition to the freehub locknut that’s already in place. This person on the other thread already linked was in your situation and that was the solution. See also Wahoo’s support page for the adapter installation.
I see you have a ticket opened already with our Support Team. If this solves it for you, please let them know. Also let them know if you need additional help. We don’t handle requests on this public forum where we may need to send missing parts and you need to share your personal information.