Thank you for the replies! This was very helpful. As everyone says, the dhcp pool range was indeed a type-o. Though I swear that I really did get an IP address.
The tagged / untagged suggestion was spot on! After making this small change, I was able to connect, and ping the MGMT_VLAN:
/interface bridge vlan
add bridge=bridge tagged=bridge vlan-ids=100
The configuration I initially tried was based of of the router on a stick example in this thread.
I’m clearly having some trouble understanding some of the fundamental concepts here. I started by trying to connect the router to my switch with trunking. After running into problems, I tried isolating the configuration just to the router.
Now that I have a working example for VLAN access ports, I’ll go back to trying to connect the router and switch via trunking.