I’d either self insure for dorm contents or get dorm insurance from an outfit like Gallagher. Cost is pretty low and deductible probably much lower than your homeowners. It wouldn’t make much financial sense to make a claim on your homeowners for the relatively small loss you might have from dorm contents.
Call your insurance company and inquire about a reduced rate for a college student far away from home. We found the cost ended up pretty close to not having the kids on the insurance at all.