Changing keychain password back to user password
How do I change the keychain password back to the user password?
iMac 27", macOS 10.12
Go to System Preferences/Users & Groups, select your account, and under the Password tab, change your user password. That should reset the keychain to your new user password.
From the article below.
If you change the user password in Users & Groups preferences, the keychain password is automatically changed to match it.