sorry. I thought  nostr:npub18u0kz84lj5tzmgywwdu4mhaa8ghtlednahqyj56kqv408lf9r23qgnlumk was in the thread. 

 nostr:npub18u0kz84lj5tzmgywwdu4mhaa8ghtlednahqyj56kqv408lf9r23qgnlumk What is blocked?
The issue with emptying a lighting wallet are the lighting fees which are hard to know upfront and there are related attack vectors to steal funds.
Thus probably all lightning wallets require a small reserve based on the amount you try to send and this sadly makes it hard to send the last sat sometimes.
If you have issues contact support and I am sure you get the sats in no time.