The Valorant error code 84 is not among the error codes listed on the official website, which is a good thing as it might just be a server-side problem. The error is mostly encountered by players in North America, Latin America, and Brazil. The constant disconnection with the server may lead you to believe that the problem is on your end, but that not the case.
There is nothing you can do about this problem as it’s a server side issue and Riot has to address it. Do not waste your time looking for solutions as the fix you apply may screw the configuration and may prevent you from joining the game once Riot fixes the issue with the server.
When you encounter the error, the first thing you must do is check the status of the Valorant servers. It also worthwhile to visit the twitter handle of the game and check if others are experiencing the error. Websites like downdetector also come handy as they will provide the status of the server for the game in your region.
To sum up, if you have encountered the Valorant error code 84, wait for a fix from Riot. Meanwhile, you can try Hyper Scape another awesome battle royale title.