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so i want to unlink my bot from the server as i don't have the access to that server anymore and i want to setup bot to a new server
It is not an issue that the bot is still linked to a different Discord server. If you use /configure link with the correct API key in a new Discord server, the old Discord server will be unlinked automatically.
Looking at the code I just discovered a bug, if you run /configure link for the first time it will unlink the old server but not link the new server. You need to run the command again. This will be fixed in the future.
If you see the message "URL was already linked to a different guild. It will be unlinked." and the new server is not linked, just run the command again.