@Clegg, Mark Thanks for posting in our Q&A.
For this issue, I have done the test in my lab. I tried the following URL and I got the "Microsoft 365 Apps (Windows 10 and later)".
https://graph.microsoft.com/beta/deviceAppManagement/mobileApps?$filter=(isof(%27microsoft.graph.officeSuiteApp%27)%20or%20true)&$orderby=displayName&
Hope it will help.
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