Plex and RouterOS

Good afternoon,
I recently purchased a RB951-2n, i am currently using this with only one issue
It is setup as a router behind my virgin media connection with basic firewall rules based on those in the Mikrotik manual (blocking bogons etc etc)
Behind this firewall I have a web and mail server which are working perfectly fine, DNAT translations for the open ports (80,443,25 in this case) no problem!

I have Plex running on Open Media Vault server, it works fine internally, and was connecting to the My Plex service when only using the Virgin Media Super Hub (with port 32400 forwarded).

On the Mikrotik I have tried everything i can think of and everything else which was listed on these forums,
Currently I have it as follows:

UPNP:
UPNP - Enabled
Allow to disable external interface - Disabled
Show dummy rule - Enabled
Interfaces = bridge (contains the port the OMV/Plex server is connected to)

NAT
11 ;;; OMV::PLEX
chain=dstnat action=dst-nat to-addresses=192.168.111.205 to-ports=32400
protocol=tcp in-interface=ether1-gateway
dst-port=32400 log=yes log-prefix=“”

12 ;;; OVM::PLEX
chain=dstnat action=dst-nat to-addresses=192.168.111.205 to-ports=32400
protocol=udp in-interface=ether1-gateway
dst-port=32400 log=yes log-prefix=“”

I found a post in this forum stating there needs to be a firewall rule as well for some reason, I don’t see why as the NAT rules are supposed to be processed before the firewall rules, but hey ho:
Filter Rules:
0 ;;; OMV::PLEX
chain=forward action=accept protocol=tcp dst-port=32400 log=no
log-prefix=“”

1 ;;; OMV::PLEX
chain=forward action=accept protocol=udp dst-port=32400 log=no
log-prefix=“”


I have installed Plex on a PC on the same network to rule that out and it has the same issues.

Any ideas?

Thanks in advance,