No one can make a seller send out a paid for item.
No idea what happened here of you have received no reason why the cancellation was made.
Check your eBay messages later , it's maintenance day on Friday for eBay things don't run smoothly today from time to time.
You may receive a message later explaining either seller cancelled due to damage/ out of stock, or eBay found fault / Vero ( this is when a Brand owner asks for the item's removal), could be a host of reasons.
@parsl634