There's a couple of possible reasons why you got the "unable to lock the disk" error. If you were using a version of Acronis older than 2017 that does not support GPT drives or the person who created your dual boot may have partitioned the drive MBR instead of GPT. I don't know what they actually did so I would suggest you follow the HS or Mojave installation guide on this site and perform a clean installation to the M.2 drive from a Unibeast installer. Of course, you'll need to disconnect the dual boot Windows/macOS drive when doing this. All the info and tools you need are here to do this. Follow the guide for which version of macOS you need. You can create the Unibeast installer on your Macbook or boot from your CCC backup drive and use that.
In step 6 of the installation guide make sure that the partition scheme is GPT. It doesn't specifically say that, but check to make sure that is selected in Disk Utility.
6. For a new installation of macOS, you MUST erase and format the destination drive according to the following steps before continuing.
a. In the top menu bar choose
Utilities, and open
Disk Utility
b. Highlight your target drive for the Mojave installation in left column.
c. Click
Erase button
d. For
Name: type
Mojave (You can rename it later)
e. For
Format: choose
Mac OS Extended (Journaled) Scheme: GUID
f. Click
Erase
g. Close
Disk Utility
Many of the moderators some of the members here do not even boot macOS with a Windows drive connected to their PC at the same time to avoid issues between macOS and Windows. Primarily file and EFI partition corruption and data loss.
Some will use hot swap bays and physically remove the HDD or SSD that the OS is installed upon. The other option is to simply disconnect the the sata cable from the drive you are not booting from before you power on the machine.
If you can't tolerate any down time that is the safest way to dual boot on the same machine. Especially if you use macOS for your work to earn a living.