Note
Mojang is aware of this issue and are working on a fix.
https://twitter.com/HelenAngel/status/1296726269359321089
https://twitter.com/HelenAngel/status/1296729030566088704
Update: The authentication servers are back up again. If you still have this issue, close Minecraft and the Minecraft Launcher. If that doesn't solve the issue, try logging out of Minecraft in the Launcher and logging back in again.
I have tried logging in to servers on both the Minecraft launcher and Badlion. It keeps saying its an invalid session. I have restarted my game multiple times, updated and restarted my computer, updated my graphics driver, signed in and out on both launchers and it doesnt fix. I have done research online and it doesnt help. I cannot think of an issue on my behalf, as i have restarted a lot of things. This is the case on both 1.8.9 and 1.16.1
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I have had the same issue and from looking at the newest reports on the site I guess it is some sort of error with Mojang
If you still have this issue, close Minecraft and the Minecraft Launcher. If that doesn't solve the issue, try logging out of Minecraft in the Launcher and logging back in again.
We do not provide any support for third-party software like Badlion.
guys i have same problem since i reset my pc and reinstall all versions and launchers but still say "invalid session"
Happening to me too, Java multiplayer is bugged rn