Transmac Drive Has Been Locked By Another Program -

Ensure no File Explorer windows, disk management tools, or antivirus scans are running for that drive. Pro Tips for Success

Below is a technical overview of why this happens and how to resolve it. Understanding the "Locked Drive" Conflict When you use TransMac to create a bootable macOS USB Transmac Drive Has Been Locked By Another Program

Fast Startup saves a kernel snapshot to your hard drive. When you plug in a USB drive that was previously mounted before hibernation, Windows restores a stale lock state. Ensure no File Explorer windows, disk management tools,

: Type list disk to find your USB drive's number (identify it by size). Ensure no File Explorer windows

Here is a review of the situation from the perspective of a user trying to create a bootable macOS USB on Windows.