GSLB gateway failover

Hello

I am trying to configure an A10 with 2 Internet Links to do response with a backup ip when gateway health check fails so I followed Multiple Gateway Links Configuration in the A10-GSLB.pdf but it´s not working

This is an example of my configuration:

gslb service-ip SIP-1 1.1.1.3
health-check HTTPS
 port 443 tcp
  health-check HTTPS

gslb service-ip SIP-2 2.2.2.3

health-check HTTPS
 port 443 tcp
  health-check HTTPS


gslb site lab
slb-dev LINK-1 1.1.1.2
gateway 1.1.1.1
vip-server SIP-1
slb-dev LINK-2 2.2.2.2
gateway 2.2.2.1
vip-server SIP-2


gslb policy PCY-TEST
 metric-order health-check
 dns backup-alias
 dns server authoritative


gslb zone test.com
policy PCY-TEST
service 443 www
  dns-a-record SIP-1 ttl 30 static
dns-a-record SIP-2 ttl 30 as-backup static


gslb protocol enable device
!
gslb protocol enable controller

So what a want to do is when LINK-1 failed the A10 response with SIP-2 and when I try it with the configuration above the site-1 gateway is down and site-1 status up but the resolution is still with the SIP-1 and not with SIP-2

Thanks!