Windows Insiders on the Beta and Release Preview channels have a new update to test. KB4598291 takes the build 19042.789 and includes fixes for issues with the Surface Hub and Windows Update:
We fixed an issue with Microsoft Exchange accounts and some Surface Hub devices that occurs after updating to Windows 10, version 20H2. The message, “Something went wrong” appears, and the error code is 0x80131500.
We fixed an issue with Windows Update scans that occurs when an authenticated proxy is used as a fallback for the sync service after the previous proxy setting fails.
We fixed an issue that causes an update from Windows 10, version 1703 to Windows 10, version 20H2 to fail on a Surface Hub device. The message “Getting ready…” remains on the screen indefinitely.
Currently the beta and release preview channel are still on 20H2 updates and share the same code.