Mac login issue after iPhone password change
I was unable to login to my Mac so I changed the password on my phone and it’s still not letting me login with the new password
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Resetting the login Password for your Mac is done by following the steps here:
If you forgot your Mac login password - Apple Support
Not sure if you changed your Apple Account password on your iPhone, but neither that or the Passcode of the iPhone has any effect on the Mac Login Password.