Selimrecep can you provide a link to the Intel iris hd driver you downloaded?
Hi! Sorry for late reply. Actually I've used "Intel Driver & Support Assistant" to update my graphics driver. By the way, I am using I5 8300H which has Intel Iris HD Graphics 630 (with version of 27.20.100.9168, as I updated. You can check your driver version from "Device Manager" if you want) if you ask. But I don't recommend manual install though (I mean there is an assistant that does for you). I downloaded Intel Assistant thing, it asked me if I want to overwrite an OEM graphic driver (which might cause issues, in my case, it didn't), I confirmed dialog and updated my display driver. It was fixed. Actually in my case it was something about OEM driver. When I was using OEM driver, the HP web site was clearly saying ".... (Windows 10 v1709)" which makes sense to have a broken driver because I upgraded my Windows to 20H2. After that, the whiteboard bug thing happened I guess. I am not using surface pen though neither tablet, just a regular PC (if it helps, just a entry level gaming pc). I know this forum for Surface tablets, but somehow same problems applys for a lot of people....
Such like, in Microsoft Whiteboard (in OneNote that happens too) when you have that bug, you can't use solid coloured pens , but you can use rainbow ones. In my case, I was able to use solid coloured pens when ruler was open (which is... weird. I saw this thing on uservoice website and tried it, it worked with ruler on).
As a result, I think it is a compatibility issue about OEM drivers and Windows. Still strange Microsoft didn't fully address this issue...
Edit: I also tried to install all Windows Updates, only updating iris driver helped me in this case. I also checked group policy thing, I already had that use (which has an username I don't remember right now), so it didn't help me either, I also tried to remove that user and add back, didn't help...
Surface tablets might have another issue. I don't know. But, really, I am using a PC and I might not expect the whiteboard application not work or neither OneNote pen drawer because, well, my screen is not a touchscreen :D I don't use this feature much, but this issue wasn't addressed for long time as I see, Microsoft should find a solution for this I guess, especially for surface pc users (which has touchscreen and a pen).