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What is wrong with my Account Lockout Policy

I have been asked by security to turn on Password lock after 10 bad attempts.
I also changed the Account Lockout Threshold to 99999 and the Reset account Lockout Counter to 99999. When I turned it on half of my organization was locked out. Any Ideas
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I think an account lockout duration of more than "a few minutes" is good security practice.

For one thing, if someone attempting to gain unauthorised access to a network tries 3 or 4 passwords and then locks the account out, the real user of that account will notify you and you will be aware of a potential security threat very quickly.

Can it be inconvenient? Yes. But what is more important?
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If you were just trying to ensure that they are locked out until an admin unlocks them, you set lockout duration to zero(default).