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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Happening to me too, Java multiplayer is bugged rn

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

Same here for older version, e.g. 1.15.2. Maybe the problem from the login mechanism

Mine's also bugged ):

mine too and im using 1.8.9 and before it was fine :/

Servers are bugged in general, the most common versions are affected 1.8+ (that I know of so far)

mine is bugged too 😞

it it solved for me. anyone else?

I can't connect either, anyone knows how to fix it?

how to do it

its fixed for me!

I have the same issue on realms, both on Badlion and on the regular launcher (1.16.2) nothing seems to work. multiplayer seems to work fine for me.

Still not working for me. "Invalid Session. Try Restarting Minecraft" I'm restarted it multiple times now.
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.

Thank you! Relogin in Minecraft Launcher did the trick.

@Bernardino Silvestre, Same for me! 🙂

guys i have same problem since i reset my pc and reinstall all versions and launchers but still say "invalid session"

This is still not working for me. I was able to connect to a server once but now get the "invalid session" message every time. I've tried restarting the Launcher, relogging in the Launcher, restarting my computer, and reinstalling the game without any success.