forgot keychain password and need to reset
I can't remember my keychain password How do I reset keychain password ?
iMac 27″, macOS 10.15
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If your Mac keeps asking for the login keychain password
The password of your macOS user account might not match the password of your login keychain. Either create a new login keychain or update it with your new password.
If you need to update your keychain password on Mac - Apple Support