Fix Windows Update Error 0xA0000400 in Windows 10

Some Windows 10 users are encountering the error 0xA0000400 when attempting to install a pending update conventionally or when attempting to use the Windows Update Assistant. Most commonly, this error is reported when users attempt to update their Windows 10 version to build 1903.

Fix Windows Update Error 0xa0000400 in Windows 10 [5 Solutions] 2021

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