You should open a ticket if you haven't. I'm never buying Lenovo again. I can't leave the USB-C cable connected to the monitor ready for my laptop when I come home because there is no HDMI/DP sound on my permanently connected PC. Lenovo claim this is normal!
I tried to connect from a Lenovo T470s and from a custom PC built by myself with ASUS MoBo. On both devices the app freestyle runs fine, but they can't discover P12 because I can't login into my account from the tablet.