However now if I disconnect device 1's management cable and/or cable for HA vlan in 1.4 interface Standby device is not becoming active.have you configured vlan failsafe or ha group?
Also even though it says configs are in sync but Device 1 has a single VLAN as I deleted a second one but Device 2 still has 2 VLAN's. vlan is not shared configuration. additionally, configsync has to run manually.
By the way I created a case with F5 on this too yesterday so far haven't heard anything back from them.it depends on what severity you created. sev4 will take 24 hours in response. anyway, if you want to work immediately, you can call them and ask to speak to support engineer. i believe they are happy to help. :-)