Either you don't have a wallet set to receive zaps or your link went busted!
My first boltz swap (testnet) using electrum wallet for testing something
https://mempool.space/testnet/tx/e72f8323de0fa8eb9540041a787d4b89694040fd0a674701877f0a352b8f3685
Discussion
I haven't received any zaps on nostr. I want to keep donations and shitposting separate so never added a lightning address.