As an admin, you can make user passwords expire after a certain number of days, or set passwords to never expire. By default, passwords are set to never expire.
Only Office 365 global admins can perform these steps.
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Go to the
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In the Office 365 admin center, go to Settings > Security and privacy. If you aren't an Office 365 global admin, you won't see the Security and privacy option.
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Click Edit.
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If you don't want users to have to change passwords, set Passwords never expire to On.
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If you want user passwords to expire, in the first box type how often passwords should expire. Choose a number of days from 14 to 730.
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In the second box type when users are notified that their password will expire, and then click Save. Choose a number of days from 1 to 30.
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When the user's password expires, they'll get a notification that appears in the lower right corner of their screen.
