DDNS Incoming connections not working when OVPN is active

[CranialBlaze]

With the VPN connected my DDNS is no longer working.

I have already added the exclusion for ddns

route checkip.dyndns.com 255.255.255.255 net_gateway

So the correct IP address is being reported over to the ddns, but I cannot get into the machine remotely using it, if I stop openvpn then its all fine again, tried adding the exclusion for my ddns host name, but unsurprisingly that's not working.

Is it possible to exclude incoming connection requests or more importantly just this one?

Thanks