You won’t get your on sound back from a server but should from a mirror.
Sometimes Alex works on stuff that makes problems until he has solved that. In general it makes sense if you try again a few hours later.
If it still doesn’t work you might try the public chat to ask others if they have the same problem. I‘m not at home for a few days and no fast internet here. I can check it during the weekend, but not earlier.
System, OS version, three digit NAT code indicating the port forwarding and sound interface would help to know what might be happening.