Interesting...
I scanned this with eNuts v0.4.0-beta and got an unknown data response...
Discussion
Because someone or maybe a bot took it, I took 4 notes from different sources, all 4 notes are 21 sats each.
It was more like an error message, not like it was already spent...
Maybe an incompatible wallet?🤔
You must have the matching mint to receive Ecash.
I am connected to the same mint.😃
The mints I use are from only 3 sources:
✅ https://mint.minibits.cash/Bitcoin
What wallet are you using?
and you will be amazed.