Back in July, Microsoft stopped offering the Windows 10 May 2019 Update (version 1903) to its own Surface Book 2 PCs, due to an issue that caused the Device Manager to stop recognizing the dedicated GPU. In fact, the issue started up back in May, but it took until October to finally fix it with a firmware update.
At the time, the Windows 10 version 1903 known issues page, said that the block from upgrading to version 1903 would be lifted in the coming weeks. It's been 10 days since the fix was released, and the page now says that the "safeguard hold has been removed". It still might take up to 48 hours before you're offered the feature update.
Some users are already reporting receiving the update:
The news comes as the Windows 10 November 2019 is right around the corner. The good news is that Windows 10 version 1909 is just version 1903 with an enablement package to set up some minor new features. There shouldn't be any compatibility issues with this new update.
Thanks to Dr. Robert for the tip!