Step 1: Go to the Click here to go to the Office 365 admin center. .
Step 2: 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.
Step 3: Navigate to Security and Privacy.
Step 4: Click Edit.
Step 5: If you don’t want users to have to change passwords, set Passwords never expire to On.
Step 6: 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.
Step 7: Enter how often passwords should expire.
Step 8: 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.
Step 9: When the user’s password expires, they’ll get a notification that appears in the lower right corner of their screen.
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