I tried to send to darthcoin@stacker.news a test and it doesn't support to add a comment.

I am using various LN wallets that support comment and also LUD-18 (nameDesc), but sending to SN account it doesn't show up.

Yeah, just tried with Alby and can include optional description.

100 sats \ 0 replies \ @k00b 21 Jan

I'll add a GH issue.