Q-in-Q and RB750 with 6.36.4

Hello.

Does Q-in-Q works on RB750 ? I attempt to configure it and I have problem. However, I make the stand with a 941-2nD (6.37.3) and the same configuration works. Is this limitation of RB750 or am I not careful somewhere ?

/interface bridge
add name=br715
/interface vlan
add interface=ether4 name=vlan715-4 vlan-id=715
add interface=ether1 name=vlan950 vlan-id=950
add interface=vlan950 name=vlan715-950 vlan-id=715
/interface bridge port
add bridge=br715 interface=vlan715-950
add bridge=br715 interface=vlan715-4
/ip address
add address=10.1.1.3/24 interface=br715 network=10.1.1.0

I have not access to RB via ether1

It works. I found misconfiguration on intermediate hardware.