ERROR CODES I MISSED:

262 = Displayed when a game cannot load after data fails to send.
264 = Displayed when a client starts while another client is already playing a game. This error can indicate an unknown/unwanted user on an account. This error can also occur if the player is warned/banned ingame, but that error code has been replaced with 273 instead of 264. If no internet issues are occurring with the account, this is likely due to the account being compromised and someone else trying to start a game while the original account owner is already playing a game. When Error 273 occurs, the reconnect button will appear on the right of the Leave Button. This error also appears if a user rejoins a game too quickly, or sometimes when a server completely crashes,
271 = Displayed when a player is inactive in a game for 20 or more minutes while playing a game alone. Because it's only themselves playing the game, error code 271 appears instead of 278. This can also happen in games that have their player counts boosted with bots; since the bots do not physically exist in the game (there is no location of the bots), but do register as in servers.
273 = Identical to error 264, however, this error occurs when a user is ingame while warned, banned or terminated. The user is kicked from the server and their page reloads, which then shows the user the ban/warn. In most cases when pressing reconnect upon being banned with code 273, error code 769 or 773 will show. But it may also happen if the same account launches a game.

The same Error Code and Reconnection aftermath can occur if a user presses ''log out from all other sessions'' in the security Tab while ingame.
275 = Displayed when Roblox closes a game server for maintenance or if a game is deleted by a Roblox staff member while being played.

Rarely displays when the private server owner disables "Allow Joining" in the private server settings
278 = Idle for 20 minutes
279 = Displayed when the client is unable to connect to the game server, which can be caused by website blocks on the user's internet, trying to reconnect to a server that crashed/froze, or when Roblox is experiencing downtime or other issues. It can sometimes occur when a user attempts to rejoin the same server before Roblox disconnects them from their previous visit, and this error can cause users to lose progress from their previous visit.
282 = Displayed when the computer has network issues, or when you are playing an experience that is under review. Error 277 can also occur.
284 = Displayed when commonly caused by a "UI Overload" (millions of UI elements on the screen, causing a client overload), but the real reason is unknown, Has Gummy Ask got banned for not abouts here.
286 = Displayed when the device that the game is being played on does not have a valid amount of memory to run the game.

"You have been disconnected because you no longer have access to this private server. (Error Code: 286)"

Displayed when someone removes you from their private server.

292 = Displayed when Roblox detects low to near insufficient memory to run Roblox. This warning is similar to error code 286, although players who encounter this warning have the choice to keep playing the game or to leave the game. Some high end games can cause this error quicker then regular games depending on the players mobile device and how it runs Roblox.

TELEPORT ERRORS

517 = Displayed when a client attempts to join a server that is in the process of closing, or when a player attempts to rejoin a server before Roblox disconnects them from their previous visit (ID 17/279 may happen too)
522 = Used to be displayed when a user attempts to join a player into a game after the player they are joining has left.

Now the new variant is in the loading screen.
523 = This is a server error, not a game error.

Displayed when the player tries to join a server that has shut down.

Used to rarely happen if you joined a friend in a private server when they left. (Status Changed variant)

Sometimes happens when joining a game which is unpublished/private.
524 = Displayed during Roblox downtime, after attempting to join a VIP server they cannot join, attempting to join a paid access game that they do not own, attempting to join a LuoBu (Roblox China) server, or attempting to join a game as a Guest (For guests, it later changed to 610).

Displayed when attempting to join a server when the game is private.
525 = There is currently not much information about this error. It happens when trying to join a full server for too much time (15 minutes)
528 = Happens when a user's party is too big to join a game that has a lower player limit (a long time ago because parties have been removed). May also happen when the player's connection is timed out and/or has problems with connection. (THE ACTUAL RAREST CODE)
529 = roblox is down

The rest will be put in the pinned comment

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