Hi @Jamie,
You can change Primary user, but you can't change Enrolled by.
Please refer to article Change a device's primary user.
Not sure what type of enrollment you are using, but Device Enrollment Manager (DEM) should help you to avoid such issue in future.
Add device enrollment managers
A device enrollment manager (DEM) is a non-administrator user who can enroll devices in Intune. Device enrollment managers are useful to have when you need to enroll and prepare many devices for distribution. People signed in to a DEM account can enroll and manage up to 1,000 devices
Best regards,
Aleksandr
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