VLAN not working when using two switches

Hello all,

I'm hoping someone else has some experience in setting up VLANS to work with more than one switch.

We are having an issue with this setup.

Sophos Firewall -->> Sophos Switch 1 -->> Sophos Switch 2 -->> Sophos AP.

In other locations we have similar setups but with only 1 switch.

Sophos Firewall -->> Sophos Switch -->> Sophos AP.

We are using the same VLAN settings that we would use with only one Sophos switch. 

1. Create the VLAN on the firewall. Give it a static ip. Add a DHCP scope for the VLAN.
2. Add the VLAN on the switch, Enable GVRP for the ports that need tagging, enable ingress filtering for the port that has the uplink to the firewall.

Then on Switch 1 we also did the same VLAN operation for the port connecting to the other switch. So switch 1 has the VLAN info as well as switch 2. But traffic is not passing between the switch to the firewall. This was tested by connecting the the wifi ssid that has the vlan set on it. Setting a static ip on the wifi connection. And doing a ping using the wifi interface. 

So I'm wondering if there's a setting that I'm missing for passing VLAN traffic from one switch to another to the devices behind it.