There was an announcement made regarding this issue a couple minutes before you posted
Same issue. Tried Reinstalling, did not fix. Was playing this morning fine.
The issue has been posted in Steam discussion channel
I cant access my account. getting message saying i need to migrate my account but i have already did so. when i launch game from steam. it bring up i need to update my account and steam is now required. if anybody can help with this i would applicate it. Thank you in advance
Last Epoch is currently down due to a Steam service outage. Services should resume as soon as Steam is back up and running. Apologies for the inconvenience.
I am getting the same message when trying to play for the first time in months. odd, I have always played on steam.
Same Issue here, and I was playing last night
Same. Steam is up and running for me but can’t get into LE.
Also experiencing this. Brand new to the game and bought it yesterday, played a bunch yesterday and today so I thought the migration thing was normal so I tried to go through it. Hopefully I didn’t lose my character 
would you please find a solution to the problem? Why do I have to log in again if I’ve always played it via Steam?
I’m able to login to every one of my steam games except LE so I’m not thinking this is a steam issue
same here
Oh ok at least now I know its not just me not able to log in or do anything…
Update 6:25 PM CT: We’ve received a number of reports of players successfully able to log in again. The issue appears to be resolved at this time. Have a great Holiday Travelers!
my friend bought the game for me on steam, yesterday i was able to play but lots of time it crashed due to lost connection to the server. today im not able to play because of account update to steam. how is it possible when i have the game on steam from the beginning?
Can hardly wait. hope we can all play on launch day and just have lots of fun 
Can’t login even tho i linked my account for 1 hour ago, it tells me i need to link my accoutn to steam. I bought the 79$ or w/e the costs on steam 1 week ago, and still havent managed to get in.
Same issue. I did everything as specified and even got the verification codes and everything. Tried to log in and still tells me my account needs to be linked when I literally logged on from Steam. This is quite ridiculous. Been two days now.
Can’t play since you did this shit , no prob go back to oblivion you little rats