No game ownership on steam

Hello,
I have some problem in running this game which worked fine until this morning. It seems like being a problem with steam. I have waited for 2-3 days, maybe it will be fixed, but not happened. I have checked all the settings again and nothing is changed. Is anyone available to help to fix this error with steam and tell me how can I prevent this in the future ?
Thank you !

No game ownership on steam
You’ve started game under a steam account, but that account does not I have The War Z game ownership
OK
