Does this error happen consistently with SN?
failed to create test invoice: Unable to connect to http://lnbits-phoenixd-phoenixd-1:9740
Afaict, we tried the domain you provided us (lnbits.mydomain.tld) but LNbits returned this error. Maybe it wasn't able to reach the container when it tried but it would work on retries?

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
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