Additionally, attempting a Failover or Move afterwards would result in an instance booting in AWS that is not accessible.
The Zertotools.bat file was executed from a disk other than the C: drive.
Since the C: drive is the "boot" disk, ZertoTools needs to execute at boot time. If it is executed on any other data disk, it will not execute at the correct time during Failover.
1] Execute the Zertotools.bat file from the C drive.
This is mentioned in the Quick Start with AWS document.