However, even if this happens to you, you shouldn't get mad that someone is blocked, as reporting or reporting a server or user in Minecraft is an important practice to keep the community fresh (that's why it's important to learn the answer to How to ban hackers in Minecraft even if I don't have a rank?)
How to unblock a server or user in Minecraft?
The first thing you need to keep in mind regarding the How question reactivate a server or a user in Minecraft is that if the user gets banned, chances are there isn't much you can do (at least for yourself).
One solution to this is to go to the main forum forum you are using (or its official page) and send a request to the game's technical support. Remember that depending on the server this can be done differently, but always open a technical support section.
When you find it, send a message explaining why the ban seemed unfair to you (it's like making an appeal). If your case is justified, the ban will be lifted. However, this will not happen immediately, remember that thousands of requests per day arrive on a large server.
If there is no response, you can always tell a friend to do you the favor by joining the server and talking to one of the moderators or administrators present, to see if they can consider you (there is always an active admin).
Remember that you shouldn't try anything weird to be able to re-enter the server in question, as nothing will do, not even changing your Minecraft username on all platforms, to sneak out.
Unbn someone from your server
So read above and you should have answered the first part of the question How to reactivate a server or user in Minecraft ?, but if you weren't the banned but you were the one who has blocked someone from the game, then you need to learn how to reverse this action.
For this you have to be an administrator, creator or moderator (otherwise, it is not possible that you will be able to use the necessary special commands). If you want to fool someone from the console, you just have to start your server and go to the called tab " Sideboard «.
All server pages should have one, so it shouldn't be very difficult for you to find it, once you are there type: / pardon followed by the player name from you want to remove the block. If that command doesn't work try / Unban also followed by the name.
Remove from game
In case you want to unbann inside Minecraft, you just have to open the game and enter your server, then press the T key, so that the game chat appears and in it write the same commands with the names of the forgiven.
This should clear them off the block list immediately and give you access to the game again. So, with the last thing you read, the question finally has an answer : how to unblock a server or user in Minecraft?
It's time for you to go to the server you use and start forgiving people, in case you are the culprit, so go ahead and apologize properly or offer a credible explanation of what happened when you got banned.
Remember that all servers are serious places, full of people looking to have fun and have fun, no one wants anyone to make fun of or cheat on you. Act like a model citizen and if the server is yours, ask others to do so.
If you have tried everything written here but are still your partner or are still banned, you will have no choice but to find a new server or create a shared world in Minecraft to play with friends (where you can place mods and maps you want).