Force install of Intune Company Portal nn Mobiles using Microsoft products which are signed in with a work account
If there is a company with for example 400 users using personal mobile phones and they have are all using Outlook (or other Microsoft products) and are already signed in with a work account there is no way currently to force them to download and install the company portal so the apps can be managed with MAM polices.
If users are currently using Microsoft products which are signed in with a work account there should be an option to force the user to install the Company portal before they can continue using the app.
The engineering team have confirmed this is not possible under ticket 13778342. They said you would need to communicate to users to install the company portal for the apps to then become managed by MAM, obviosuly if you do not force users they are not likely to do it.