Ah, yeah. Muun doesn't support NWC, which is the absolute easiest way to zap on Nostr in my experience. Muum is an odd wallet in other ways, too, which can come back to bite you on fees in a high on-chain fee environment. This is because Muum is actually an on-chain wallet masquerading as a Lightning wallet. When you pay via Lightning, Muun does a submarine swap automatically to exchange the on-chain funds over to Lightning before sending the payment. So you are having to pay on-chain fees with each payment sent. Adds up, for sure. I would recommend using a Lightning wallet specificly for zapping with Nostr, and one that supports NWC. Doesn't matter if it is custodial, as you should only keep a small amount in it anyway. Coinos or Minibits are both still decent options, I think. Zeus is also a really good option, but you'll need to use the ecash side of it at first, and that takes a little bit of setup. Looks like you are using your Strike Lightning address to receive zaps, and I don't think Strike supports NWC either. All three of the options I mentioned above will give you a Lightning address you can use for zapping.

I did receive it, and thank you!