Keychain password
I don’t remember my keychain password. How do I find out or change it.
MacBook Air
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You will need to reset your default keychain:
If you don’t remember your previous user password, you need to reset your default keychain. Resetting the default keychain deletes all the passwords saved in the keychain but lets you sync your login password and the password stored in the keychain.
To do this, change your password in Users & Groups settings, and the keychain password is automatically changed to match it.
See this link for further reference
If you need to update your keychain password on Mac – Apple Support (UK)