@Yop Thanks for posting in our Q&A. From your description, what did you mean Win32App deployment report? Is it "Device instll status" in intune portal? If there is any misunderstanding, please correct me.
For Q1: The following article describes the flow of win32 app deployment:
https://learn.microsoft.com/en-us/troubleshoot/mem/intune/develop-deliver-working-win32-app-via-intune#the-flow-behind-deployment-of-a-win32-application-from-intune
Based on my understanding, if the app doesn't reach to the device, the device will not send install status to intune. Given this situation, please make sure the devices connect to network. Then wait for some time and check if the number of the devices has increased.
For Q2: Based on my experience, successful, pending or failed status are all reported.
For Q3: There is no limit number of devices in a group to deploy win32 app.
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