Moving AGS from Firefly to Victron

Had my Victron system moved over from a 5th wheel to a Class A with Firefly. In hindsight, probably should have just left it alone, but here we are.

The installer added a second transfer switch to “trick” the firefly into thinking it is always connected to shore power, and this allows the ACs to work without shedding. Anyway, the AGS no longer works.

Can someone provide guidance on how to move the AGS capability from the Firefly system over to Cerbo? Is it as simple as finding the wire from the generator to the Firefly control module and moving to the Cerbo? I have 2 Multiplus IIs running as master/slave, if that makes a difference.