This sounds like you don't have a "Region" object defined. In Magnetic simulations, we need a larger object with "Vacuum" or "Air" material in order for the simulation to define the domain to calculate magnetic fields. You can either subtract the other objects from within that vacuum object, or you can leave it just as a larger box and the mesher/solver will implicitly subtract out the magnetic objects from the vacuum region. This should resolve the "single connected" issues.
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