If you are currently using the Windows Store version of Sea of Thieves and are receiving the Corrupt Error Code A01 when trying to launch the game (such as shown below):
Please first try adding SOTGame.exe to your anti-virus applications white list.
If the issue persists after that we would then recommend trying to boot the game after disabling your anti-virus.
Sophos have also released a workaround for their users who are receiving this issue: