After dying an respawning (in this case instant respawn) you cannot use supports.
- Legacy ID
create a support (artillery, transport chopper, attack chopper) use support it works, die respawn and now it does not.
I can confirm this bug. Every required module is synched:
Player <--> Support Request <--> Support Type <--> Support Vehicle
After respawn the option is still avaiable in the command menu, but it can't be called anymore.