Daisy chaining alcatel omni 6850s

Hi!

I have an alcatel omni 6850 connected to the backbone.

I am trying to connect ANOTHER 6850 to that 6850 to get more ports. Daisy chaining

I am pretty new to this so dont assume knowledge. I might be overlooking something basic.

On the first four interfaces I configured them for fiber. I got switch A on the backbone and switch B talking to A.

A has every mac address on the whole network. B only has A+B so it's not getting mac addresses from the backbone.

I made sure 802.1q was on for both fiber ports.

The only issue I can maybe see is that the backbone expects to see switch B by a unique IP on a direct fiber connection when of course its connected through A

What am I maybe missing?