So I would submit the claim to Air Dolomiti after the cancelled flight was supposed to land?

EDIT: I see the highlight in the quote. So I claim through UA, after I land in EWR?

I found out this morning when I was checking in. I am not sure when it was actually cancelled. I have no email from United about any delay or cancellation. But another person in my group is on the same flight, but 2 days later and was notified this morning.