HA: Primary Node not avaliable after initialisation

I did fresh install of two 19.5 Appliances (virtual, VMware).

(Quick-)HA-Config took some time but succeded. Right after initialisation primary-nodes becomes inaccessible using primary ip-address.
Not pingable, no internet access, no webadmin, no ssh.

Auxiliary node reachable using webadmin / ssh. Primary node reachable using ssh through HA-interface from auxiliary node.

HA-Switch / reboot results in same behaviour.
Right before HA-configuration both devices were accessible using configured interfaces and as problem moves this is probably not related to virtual hardware configuration.

Any Ideas? Any Logs i can provide?


added console ha-screenshot
[edited by: ffnn at 8:57 AM (GMT -7) on 21 Oct 2022]