XGS 18.5 MR2 - HA could not be enabled

What am I doing wrong here?

1st. on the AUX node I went to HA and initiated HA as aux there, selected HA peer IP 10.1.178.5

2nd I went to the PRIMARY node and configured it as primary, selected HA peer IP 10.1.178.6

found this old post, so checked default WiFi SSIDs and DHCP servers, deletd both.

https://community.sophos.com/sophos-xg-firewall/f/discussions/124364/problems-to-configure-high-availability

no luck