I've got 3 options to join one of my severs:
Ingame community servers
Steam servers
In game direct connect
Usually one of them works.
If I set up CS:GO, MC or something else, it works right away. It's just Valheim that is a bit buggy. But it's in early access.
For the record, I'm just trying to help you with troubleshooting, since you're so nice at helping, so I wanted to give some back