I finally solved this on my own. I combined the two bridged inner vlans 127 & 999 on a trunk interface with the inner-vlan-id-list. This is the config that works:
user@FTMY-T3-EDGE-01# show interfaces ge-2/3/0 flexible-vlan-tagging; mtu 9192; encapsulation flexible-ethernet-services; unit 1176 { vlan-id 1176; family bridge { interface-mode trunk; inner-vlan-id-list [ 127 999 ]; } } unit 1276 { vlan-tags outer 1176 inner 1276; family inet { address 63.247.145.69/30; } }
If anyone has any better methods, please feel free to reply.
Thanks!