The container must have reachable as it is running next to the Lnbits container, and I tried the curl command literally a few secs later, successfully.The container must have reachable as it is running next to the Lnbits container, and I tried the curl command literally a few secs later, successfully.

That said, I went through the process again just now - and it magically works now. I can save the incoice key, without error message. Weird. but at least it works