Unable to use a switch on Lan

[Aelindgard]

Hi my network topology is as follows

Archer C7 v2

 +-------+ 
 | WAN   | ------ Fibre Modem
 | LAN1  | ------ AP1
 | LAN2  | ------ AP2
 | LAN3  | -------TP-Link SG105E Switch-------+ -- PC1
 | LAN4  |                                    ` -- PC2
 +-------+                                                          

Devices connected to the 2 APs are able to get a DHCP address and join the network but devices connected to the switch are not able to see the router and get an address. The switch is able to get an IP address of its own on the switch's port 0 so that it can be managed.

Troubleshooting done:
I swapped out the router with another running stock OpenWRT and devices behind the switch is able to get an IP address. The settings on the br-lan are the same on both routers.