I was able to pay that invoice, but it wasn't as easy as it should have been. When viewing your note, I see button that says [PAY]. When clicking that button, it opens my lightning wallet and shows that the invoice is requesting to pay 0 sats, which is impossible.

So instead of just using the lightning wallet that I have integrated into my firefox browser (getalby.com), I opened my Wallet Of Satoshi app on my phone, scanned your 0 sats invoice. WoS then prompted me to specify how many sats to send.

I successfully sent you 21 sats.