Hey there, did you try to join through the android app? Here this should be a valid link, tested it. https://discord.gg/VFq9HSr93E
Edit: From what other users found out, some browser do not work. Try another browser! :)
Got this reply from Discord:
Based on the information and what you've described, the most likely reason you can't join is that the server owner has paused invites. When invites are paused, anyone who tries to join will see a message and won't be able to access the server, even if the link appears valid and works for others who joined before the pause.
If you have a way to contact the server owner or moderators, I recommend asking them if invites are currently paused. Once they re-enable invites, you should be able to join using the same link.
Well, interesting response from Discord but also very reasonable, but I don't have the invites paused. A couple new members joined today. Here, I made this temporary invite link, try it out: https://discord.gg/zRdGNtBB
All good and sorry to hear that it still won't work. I had 5 people joining today, so it sadly has to be on your end. My research showed that your account may be restricted or limited and thus not be able to join. The Discord response might be just a generic error message. When you can't join other adult servers, that might be it.
You also might have been banned on the server if your account got hacked before?
Feel free to follow here or on Patreon / Subscribestar though, if Discord won't work! :)