Cisco SG350 switch VLAN DNS help

I'm a novice when it comes to networking so please bare with me. I have a new network I'm setting up and have issues with DNS.

My setup is as follows | ISP -> Modem -> Untangle Firewall -> Cisco SG350 switch -> Devices and AP

On my switch I have 5 VLANs. Firewall IP is 192.168.2.1. Switch IP is 192.168.2.10. Vlan 1 = 192.168.2.X w/ DHCP from Untangle. VLAN 20 = 192.168.20.X w/ DHCP from switch. VLAN 30 = 192.168.30.X w/ DHCP from switch, and so on for VLAN 40 and 50.

The Untangle Firewall is in router mode with static routes to my switch VLANs.

DHCP from the firewall successfully provides DHCP and DNS to the VLAN 1 on switch. VLAN 1 ports connect to internet no problem.

My problem is I don't know how to pass DNS from my firewall to the VLAN 20-50. Inter-vlan is routing correctly. Connecting to VLAN 20-50 I can ping the Firewall and other switch VLANs successfully. The firewall can also ping the VLAN IP. However, on the device connected to the VLAN, it does not receive DNS. From the connected device, I can ping 8.8.8.8 but cannot ping google.com.

I simply want to point VLAN 20-50 devices to DNS 8.8.8.8. What do I need to do?

note: this is a 'cross-post' from /r/cisco

Here's my switch config:

config-file-header

switch58785p

v2.5.5.47 / RTESLA2.5.5_930_364_286

CLI v1.0

file SSD indicator excluded

@

!

unit-type-control-start

unit-type unit 1 network gi uplink none

unit-type-control-end

!

vlan database

vlan 20,30,40,50

exit

voice vlan oui-table add 0001e3 Siemens_AG_phone

voice vlan oui-table add 00036b Cisco_phone

voice vlan oui-table add 00096e Avaya

voice vlan oui-table add 000fe2 H3C_Aolynk

voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone

voice vlan oui-table add 00d01e Pingtel_phone

voice vlan oui-table add 00e075 Polycom/Veritel_phone

voice vlan oui-table add 00e0bb 3Com_phone

no eee enable

no ip arp proxy disable

ip dhcp server

ip dhcp pool network "VLAN 20"

address low 192.168.20.100 high 192.168.20.200 255.255.255.0

exit

ip dhcp pool network "VLAN 30"

address low 192.168.30.100 high 192.168.30.200 255.255.255.0

exit

ip dhcp pool network "VLAN 40"

address low 192.168.40.100 high 192.168.40.200 255.255.255.0

exit

ip dhcp pool network "VLAN 50"

address low 192.168.50.100 high 192.168.50.200 255.255.255.0

exit

bonjour interface range vlan 1

ip name-server 192.168.2.1

!

interface vlan 1

ip address 192.168.2.10 255.255.255.0

no ip address dhcp

!

interface vlan 20

name TRUSTED

ip address 192.168.20.1 255.255.255.0

!

interface vlan 30

name NVR

ip address 192.168.30.1 255.255.255.0

!

interface vlan 40

name WIFI

ip address 192.168.40.1 255.255.255.0

!

interface vlan 50

name IoT

ip address 192.168.50.1 255.255.255.0

!

interface GigabitEthernet1

switchport mode trunk

!

interface GigabitEthernet2

switchport access vlan 20

!

interface GigabitEthernet3

switchport mode trunk

switchport trunk allowed vlan 1-19,21-29,31-4094

!

interface GigabitEthernet4

switchport mode trunk

switchport trunk allowed vlan 1-19,21-29,31-4094

!

interface GigabitEthernet5

switchport access vlan 20

!

interface GigabitEthernet6

switchport access vlan 30

!

interface GigabitEthernet7

switchport access vlan 20

!

exit

ip default-gateway 192.168.2.1