Not Authenticated with Minecraft.net
There are a number of reasons why you might receive this error when trying to access our network. The most common way of fixing the "Not Authenticated with Minecraft.net" error is to restart your client. However, if you are using a cracked/offline client (including TLauncher) you will always receive this error because you do not own an official copy of the Minecraft game or own a Minecraft account.
If you are still experiencing this error after restarting your client, and you are using a legitimate account, please contact Minecraft's dedicated support team by going to: https://help.minecraft.net/hc/en-us/requests/new?ticket_form_id=360001225811
Invalid Session (Try restarting your game)
Usually this is a rather easy fix, and a quick restart of your Minecraft client will fix the issue as it generates a new token/key allowing you to access Minecraft's multiplayer services. If restarting your client doesn't work, please try relogging into your Minecraft account. Sometimes this error might also show after maintenance to Minecraft's servers: "Authentication servers are under maintenance" error.
Out of Memory/Not Enough Memory
This error will usually show when your device has or is running out of memory to run the game. When you receive this error, the best thing to do is to close any applications you might be running in the background to allow Minecraft enough memory to continue running the game. However, if the option is available, it will always be a better option to upgrade your RAM on your PC. Upgrading your RAM is a physical task requiring you to buy new RAM online and insert it into your PC.
Authenticate with Microsoft Services
This error occurs when you are not on the latest version of Minecraft. Minecraft (Mojang Studios) has updated the game so that servers can only be played on the latest version of Minecraft: Bedrock Edition. Java Edition users will not be affected by this.