iMac password reset itself after upgrading to Sequoia 15.3
iMac 27", 2019. Recently upgraded to Sequoia 15.3. This morning, my password is no longer recognized as correct. Fortunately, was able to unlock with Apple Watch, but can't reset iMac password without first entering old password, which is being rejected. Likely will request password when trying login with watch soon, so I need to resolve issue quickly. Thanks!
[Re-Titled by Moderator]
iPhone 15 Pro, iOS 18