MX Q-in-Q With Multiple Inner Tags not working

I am trying to build an interface that sends 3 seperate VLANs inside an outer tag across the network.  One of the logical units is a Layer3 IP interface and the other 2 are bridged VLANs.  Using the below config, the Layer3 Interface passes traffic and then only 1 or the other (whichever one I build first) of the bridged units will pass traffic.  How can this config be modified so all 3 VLANs pass traffic at the same time?

MX480

user@FTMY-T3-EDGE-01> show configuration interfaces ge-2/3/0 
description "--- UPLINK TO NNI ---";
flexible-vlan-tagging;
mtu 9192;
encapsulation flexible-ethernet-services;

unit 1276 {
    vlan-tags outer 1176 inner 1276;
    family inet {
        address 63.247.145.69/30;
    }
}
unit 11767 {
    encapsulation vlan-bridge;
    vlan-tags outer 1176 inner 127;
}
unit 11769 {
    encapsulation vlan-bridge;
    vlan-tags outer 1176 inner 999;
}
user@FTMY-T3-EDGE-01> show configuration bridge-domains 
VLAN-127 {
    description T3-VOIP;
    vlan-id 127;
    interface ge-2/3/0.11767;
    interface ge-x/x/x.127;
}
VLAN-999 {
    description T3-CUST-MGMT;
    vlan-id 999;
    interface ge-2/3/0.11769;
    interface ge-x/x/x.999;
}

Again, in the above config I can ping across unit 1276, but I can only ever ping across either 999 or 127 and not both when enabled at the same time.  How can I configure this better so it will work?