Make sure that:
- Your Email for your Discord account is verified.
- Your Phone Number for your Discord account is verified.
- You set your birthday for your Discord account to be at least 18 years old ๐. (Year of birth should be year 2008 or less, since the server has an age restriction, account who is under 18 years old cannot join.)
- And make sure that it doesn't say that "You are banned" when you are trying to join.
If you already have all the requirements above, then it must be because of something else.
We cannot help you if it has something to do with regional issues, since some countries have a things for Discord.