Hello,
Please check the following point:
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First (in both equipement):
check that you set in Device Management -> Devices -> Device Self, then in Device connectivity all vlan that have to be used by peers for ConfigSyng FailOver and Mirroring. You have to use the same vlan (HA vlan) for each functionality.
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In the vlan that you use for HA check in the self IP that you set "port Lockdown" to Allow default.
Additional point connect in CLI on one members en try to ping another one in your HA IP (and telnet on port 443 too...). Because if you can't reach another one from your HA interface it's probably du to network/Vmware problem...
- In your Devices Groups check that both memebers are include and you set your group type as Sync--Failover.
Additional information I don't now if you had created a specific VLAN for HA, if not I advise you to do it because it's not advisable to use you business vlan (bandwidth consumption, not secure with port lockdown default, ... ). But if you can't just be carefull to open only the necessary flows on the fw.
Regards