It turns out that Swedish numbers purchased via Highlevel cannot receive inbound calls.
This is a severe limitation since it means we cannot actually use the numbers for anything useful. If a client calls the number, the call just gets dropped.
I thought it was a setting at first but this is the response I got from Support: "​I did go ahead and confirm with my product owner there aren't any voice-capable numbers".
Please add the ability to receive calls to Swedish phone numbers purchased via Highlevel.