@MoTaar, Thanks for posting in Q&A. Based on my researching, I didn't find the report to get the installed apps on all Intune managed devices. But I find some links describe the scripts to do this. maybe it can help.
https://www.powershellgallery.com/packages/psIntune/0.1.7/Content/Get-PsIntuneDeviceApps.ps1
https://timmyit.com/2019/12/04/get-all-assigned-intune-policies-and-apps-per-azure-ad-group/
Note: Non-Microsoft link, just for the reference.
Hope the above information can help.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.