Issue with site-to-site VPN during HA failover in Azure fortigate ha active passive with ELB-ILB

[suku]

Facing issue with site-to-site VPN during HA failover, traffic is getting dropped for few seconds, also session is getting dropped. i.e failover is working fine but facing some network fluctuation during failover. 

Using azure Fortigate vm-64Azure. os 7.2.3

Deployed from Azure marketplace with Active-passive HA with ELB-ILB plan.

please help if any additional configuration needs to be done for VPN, as this deployment model comes with predefined HA configuration.

[gfleming]

Based on Azure and Fortigate documentation for your architecture a few seconds of failover is within spec.

Can you confirm your HA config matches the config provisioning outlined in this document? https://github.com/fortinet/azure-templates/blob/main/FortiGate/Active-Passive-ELB-ILB/doc/config-pr...