User passwords expiring despite requests not to?

I am a partner associated with the account in question. The business owner has requested that passwords never expire.

Using the   "Get-MsolUser | Set-MsolUser –PasswordNeverExpires $True", I have made the change to ALL users, and have a been able to verify that for each user, I get "PasswordNeverExpires        : True"

However, most users still get passwords expired in their Outlook after 90 days.

Is there a glitch in the system, or I am doing something wrong?