I have to use my remote display adapter. I am using remote access.
BUT it works when I download in H.264.
AcidDream
Then the reason for your problem is found.
The Remote Display Adapter can't encode AV1,
and I don't know why it's different with older SF releases.
so try this in Group Policy Editor (gpedit.msc)
Computer Configuration > Administrative Templates > Windows Components
> Remote Desktop Services > Remote Desktop Session Host > Remote Session Environment

Use hardware graphics adapter for all Remote Desktop Services sessions
edit:
Looks like "Use WDDM graphics display driver for Remote Desktop Connections" need also to disabled => see 18
herein german: