NVR VLAN

Just a little confrused.

My normal untagged LAN is running on a 192.168.101.x subnet

I have an NVR that has a network facing port and an internal switch on a different subnet (192.168.100.x) I am wanting to be able to route traffic from a management PC on the main network to control the individual cameras that are on the NVR switch.

I have the NVR network facing port plugged into the Dell Switch on port 3 and one port of the internal switch on the NVR connected to the Dell Switch port 4

Mikrotik ether1 to WAN
Mikrotik ether2 to Dell Switch Port 1
Dell Switch Port 3 (set to default vlan100) to NVR
Dell Switch Port 1 is Tagged for vlan100 and untagged traffic

On the Mikrotik I have created an NVR vlan100 interface and have tried to attach that to both the bridge and the ether2 on the Mikrotik (Which is correct, I have read the ether and not the bridge?)

I have tried adding addresses of the VLAN in the (IP)Address List as 192.168.100.0/24 or 192.168.100.1/24 - with the latter I can ping the 192.168.100.1 address from the local lan but nothing else.

I know I must be missing something, and I’m not sure if it has to do with how these interfaces are setup, the routing, or something else minor that I have overlooked. Since the NVR has its own gateway and dhcp for the cameras I’m not sure how my lan figures out where the gateway is and I can’t ping the gateway of the NVR from the local lan.

Now I’m sure it can’t be that hard… Starting with the router:
Create VLAN INTERFACE - but should I attach it to the ethernet2 port, or to the existing bridge, or create a new bridge?
Then do I create the /ip/address for the subnet that the NVR is running on in the vlan100? (again, what interface should I choose)
Is there anything else special I need to do with routing or gateways?