Invalid session - Please try restarting Minecraft

Got the same problem:
-relogged in launcher
-restarted launcher
-reinstalled both minecraft and the launcher
-changed password (i've read on reddit that could be a hacking problem)
-rebooted windows
-tried on third part launchers (techniclauncher, curse (now twitch) launcher)
everything is vanilla: no mod, no launcher, no cracked client, no resource pack and so on

The issue persists.

Same issue, Restarted launcher, also logged out and back in, my friend is going to try and remove then re-add me to the realms whitelist to see if that helps

EDIT: MY friend has same issue, cant even access the admin panel for the realm

EDIT 2: Lots of issues reported over at Down Detector

having this issue as well please fix

Also having this issue on two user accounts and two separate computers. Local worlds work. Realms go straight to Invalid Session ID, Please try restarting Minecraft. - Re starting or Re install does not fix

Same problem. I'm a realm owner and as soon as I click on Realms from the launcher it shows me the error. I can't access realm admin options, whitelist, anything.

The same here with me and my cousin.

Same here. I was in realms earlier today and I went to get lunch to only come back to it unable to work. I have looked up everything in an attempt to fix it even trying multiple times and nothing has worked.

Just attached a log file, hope it helps

Also having exactly same problem.

Attempted to run previous version 1.12 and 1.11 no joy same issue.. seems to be a server level failure

I am having the same issue

Well, the more people that vote on this the quicker it will be fixed and we can all get back to playing.

Same issue here

same issue

Same. Me and my friend went to get on and it gave me the same problem

Having exact same issue, restarted launcher about a million times and even shut down and restarted my computer.

Same issue here

Same issue for the past 2 hours. I think my cows are getting hungry!

Tried restarting Minecraft and launcher, loggin off/on, different user, different PC, and reinstalling. Nothing has worked.

I got the same issue. I am not able go into realms but everything else works fine. I've tried restarting launcher / logging out and restarting launcher / restarting computer / running minecraft program in Admin / reinstalling minecraft. None of that seemed to work. 😞

Edit:
(3:40pm est.)
They seemed to fix the issue, now it allows me to join realms with no issues!

Same issue in the midwest, UK, and NYC.

Same, reinstalled java and launcher, nothing helped. about 4 hours now.

http://downdetector.com/status/minecraft

Bump

Same Here Too

Just wow how has this not gotten assigned yet.

People are reporting it on Reddit, down detector, Twitter, etc. and they are not even aware I think.

Closing as invalid, not a bug but a service issue.

I have started having this problem today, and so has a friend (who owns the Realm).
We are both on 1.12.2, and have been visiting the Realm frequently.
I had only last been on the Realm earlier today, and now this bug has appeared, preventing the Realm from being used.

(A group of us had been working on preparing the Realm to be opened to the rest of our friends tomorrow, and we were planning a big celebration... I do hope that this issue will be resolved soon...)

Edit: Realms has started functioning again, for me, at least. Thanks to whoever is responsible for this, and I hope that the problem is solved for everyone else, too.