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Error: Unable to mount source .wim file when trying to create Acronis survival drive on my usb disk drive

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Jonathan, welcome to these User Forums.

Please see forum topic: Media Rescue Builder geht nicht: Failed to mount the source .wim file where another user reported a similar issue recently and found a resolution.  The majority of this topic is in English except for the initial post.

The key issues here were: not running as Administrator / encountering a non-empty temp\MntWIM folder used by the process, and needing to disable UEFI Secure Boot in the BIOS settings for the Windows ADK version involved.