Ok,
So now you know why you cannot connect to z2 core.
Enable it in mode entry module by:
1. Providing z2 start address in CADDR register and set also RMC bit in this register.
2. Define in which mode the z2 will be active in CCTL register.
3. do mode transition to mode where z2 is active.
Now you can connect with no issues.
Peter
PS: if you still struggle check my example code:
https://community.nxp.com/docs/DOC-335369