How does Splunk alerts about expiration alert when Password Policy Management is enabled?

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We have enabled Password Policy Management & need to know how will the expiration alert come if we have set 15 days as value for expiration alert to come & 90 days for password expiration for the local accounts.

Does it comes as a message on the UI?
Will it notify every local account user?
How the warnings come?

We just have the process defined under

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