Force PIN onstartup with Intune company portal install.
Force PIN on startup with the Intune company portal install for all phones.
As of the March 26 updates, after a compliance or configuration policy is applied to an iOS device, users are prompted to set a PIN every 15 minutes. Users are continually prompted until a PIN is set. So, not forcing exactly, but nagging, a lot – is that close?
Not using a vote here, although I do agree it would be good to have this capability.
However make sure you're aware of the ramifications of forcing that on for your Android users.