The developers said they’ve already received reports about this issue. There’s even a comment from the dev/mod team above saying they merged all related reports into this main topic, which is a sign that they’ve started looking into it and preparing a fix.
We just don’t know when it’ll actually be fixed yet… it’s taking quite a long time sadly 
Game Version: VO.8.5
Platform: Steam windows
Mods: never used
Hardware Specifications & Operating System Windows 11 , CPU 9800x3D , GPU 9070xt, RAM 32GB 6000 cl30, 2TB gen4 storage
Issue Date: May 21, 2026
Error Message: steam authentication failed ,please restart steam client.
Details: After updating, my game is malfunctioning. I am unable to launch it as it repeatedly crashes. Additionally, an error message from Steam
Hey there, welcome to the inZOI forum!
This is a bug which currently affects a lot of players unforunately. Thank you for reporting it 
To the team: Please merge with the main thread After update 0.8.0 , Steam authentication failed, please restart steam client → Thank you in advance 
Hi @LiHua_0008 
I’ve merged your post into the existing main thread regarding the launch/crashing issue after the update. This will help keep similar reports organized and allow easier tracking of updates related to the issue. Thank you for your understanding! 
I’ve moved your post to the Technical Help category so it can be more easily tracked and reviewed by the team.
Just a quick note: the Technical Help category is intended for issues that affect the game’s ability to run properly, such as launch problems or frequent crashes.
Thanks for your help!
I had tried it before the hotfix and it didn’t work, but today, seeing your message, I decided to try again with proton 1 1 and it worked, thank you so much.
I had tried it today with other protons and they weren’t working but with the 11 it worked now, really, thank you so much, I was quite frustrated with it.
I really hope this thread doesn’t get buried so the developers won’t forget about fixing this issue. It’s been a whole month already and I still haven’t been able to play inZOI since version 0.8.0… way too long.
Same here. After today hotfix, issue still persists. Dev please look into this matter.
What happen from the dev ? After hotfix 0.8.6 , still this issue
It’s been over a month since I was last able to play inZOI because of the Steam issue. I really miss the game and feel disappointed because it’s one of the few games that truly suits me. I have no idea how far along the developers are in fixing it, but I’m still hoping and checking for updates every day.
Yes, after I reinstalled this game today, I discovered that it keeps showing a Steam authentication failure prompt. I’ve tried countless methods but nothing works. Why hasn’t this critical bug been fixed for as long as two months? I’ve been playing since the first day of release. I hope the developers can fix this bug as soon as possible.
I hope June update will be end this waiting 
I’ve been playing the game for 6-8 months and this has never happened to me. It’s a very strange problem.
Are you experiencing this bug? I don’t understand why it works fine on the old version from March 26th, but since version 0.8.0 I haven’t been able to get into the game. If they can’t fix it by June, I’ll probably look for a way to get a refund.
No thankfully i’m playing the inzoi. 
Me too unfortunately the inzoi was my fav game if the problem stay to the next month so sadly I will ask for refund
