It works now!

The reason you can’t use Muun and other types of self-custodial Lightning wallets is because Lightning Addresses require a webserver to pass the request to the node. Here’s some info for you.

nostr:note1kd42ypacnj5a7phxqh7mnn0hkh8q3uwk3qxlg3t3mmcd8yjwar9q7p0xrc