Opnsense HA - Client OpenVPN doesn't restart connection

[bdario]

Hello,
my environment:

2 OPNsense 24.7.3_1 in High Availability (CARP and pfsync work fine)
1 Public ip shared byy the firewalls
OpenVPN server 2.6.12
OpenVPN client 2.5.9

OpenVPN server configured on each firewalls
With OpenVPN client I get connection to both firewalls

Issue:
When the master firewall goes down OpenVPN client doesn't reconnect automatically (I must force reconnection from the client)

I would like to have a client automatic reconnection.
I tried with "persist-tun persist-key keepalive 2 10" but doesn't work

Can please anyone help me to solve this issue?

Greetings
Dario