DHCP not working over charter circuit after cutover.

So I have an interesting problem going on.

DHCP and DNS is hosted on our data centers and handles all DHCP across all networks. Remotely and locally. DHCP is not served at the branch location on site, rather they communicate back to the DC.

Or circuit provider for a branch location went out of business so we have to get another provider in. Pretty much is the same link, different owner. However there is an issue with TLS and QinQ.

We only have one VLAN onsite and two virtual interfaces on the router that route to two separate Data centers.

In short. Since the cut over, everyone works except DHCP.

Why? I'm curious to see what other people's thoughts are.

Currently we set up a scope on the router for now and removed the helper in the router.