https://wccftech.com/microsoft-removes-multiple-windows-10-1903-upgrade-blocks/

Microsoft has removed a few Windows 10 May 2019 Update upgrade blocks, after resolving the associated problems. The company had put what it called a safeguard or protective block on affected devices that couldn’t be upgraded to the latest version of the operating system.

The issues that have now been resolved and the upgrade block has been on the affected machines, include: