@entername when you're trying to join the game, did you copy the game name by highlighting the text off the website and pasting it into your bar to join in-game?
If yes, Battle.net has a thing in place where if you copy and paste something incorrectly it will cause a temporary IP ban on that server specifically. Tends to last a few minutes then you can re-enter the server. If you want to prevent this issue in the future i'd recommend using the clipboard icon next to the game name or manually typing out the game name. Though it does not give an animation when hovering over the clipboard icon, when clicked, it will copy the text only and that can be pasted into the bar to join the game.
If this is not what is happening, sorry for the long post and wasting your time
