I am unable to lock the Keychain Acccess on either of two macbooks. The login password is not accepted on either one.
Is there a special step/process for setting up a keychain password - and it is not synced with the login?
If you have iCloud keychain sync enabled the "local" keychain will not have your account password any more. If you reset your account password using the recovery drive the keychain password will be the old account password.
If you know your old password, use that password to update your existing login keychain: