ContributionsMost RecentMost LikesSolutionsRe: MacOS: A keychain cannot be found to store.... Hello, I just had the same issue in the brand new Mac I got today. To solve it we just opened the Keychain Access tool and deleted the login keychain (it did not had an icon, signal for something strange happening). Then I rebooted the Mac and... voilĂ , rebooting solved it! Upon reboot it recreated a new working one. I suppose the first one had been created by some corporate setup tool as root and my user, despite being an admin, could not access / write to it.