In response to William's reply - please do not take my mark as 'unhelpful' as personal. This is a reflection on how the Microsoft organisation support users when issues like this occur.
Microsoft's support processes and organisation in cases such as this are inadequate and needs improvement.
This support page appears to try to deal with all Windows 11 issues and does not allow granularity on reporting specific Graphics hardware compatibility problems with this new release.
The failure of an onboard iGPU (Intel) in a Windows system to work alongside a discrete GPU in a major Windows release is a serious functional problem and needs priority focus to fix.
Any problem like this should have been trapped at QA stage prior to release to the public.
As regards just ASUS devices being affected, this is in fact not correct as I have seen users of MSI Motherboards also reporting exactly the same issue. It is not solely limited to ASUS.
I looked at the reported problems link you included.
This does not mention issues with a Graphics iGPU. It simply states there can be a problem to complete the Windows update to 24H2.
I think this refers to a different issue entirely.
The ASUS models mentioned in this article are in fact Laptops, not discrete PC Desktop motherboards such as ASUS Z series.
There is not even any mention in Microsoft's bulletin here about the ASUS Z890 series as published below by ASUS themselves. https://www.asus.com/support/faq/1054046/
As a result, I have not gained any new insight into what is happening about this iGPU/GPU issue on Windows 24/H2 release from Microsoft.