It failed detail output:
”Partitioning disk “APPLE SSD SM0256L Media” (disk0)
Resizing the startup volume will cause this computer to stop responding.
Running operation 1 of 2: Add “Windows” 114,9 GB by shrinking container disk1 “Macintosh HD” (disk0s2) from 250,69 GB to 135,78 GB…
Aligning shrink delta to 114.904.825.856 bytes and targeting a new physical store size of 135.780.749.312 bytes
Determined the minimum size for the targeted physical store of this APFS Container to be 42.345.693.184 bytes
Resizing APFS Container designated by APFS Container Reference disk1
The specific APFS Physical Store being resized is disk0s2
Verifying storage system
Using live mode.
Performing fsck_apfs -n -x -l /dev/disk0s2
Checking the container superblock.
Checking the EFI jumpstart record.
Checking the space manager.
Checking the space manager free queue trees.
Checking the object map.
Checking volume.
Checking the APFS volume superblock.
The volume Macintosh HD was formatted by storagekitd (1677.81.1) and last modified by apfs_kext (1677.81.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking snapshot 1 of 1 (com.apple.os.update-DCA53726C55B1F85C9B53B535BFFD44ADC546530E0ED9F3DA8BD8BC34C936B3A)
Checking the extent ref tree.
Checking the fsroot tree.
Checking the file extent tree.
Checking volume.
Checking the APFS volume superblock.
The volume Preboot was formatted by newfs_apfs (748.1.46) and last modified by apfs_kext (1677.81.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking the extent ref tree.
Checking the fsroot tree.
Checking volume.
Checking the APFS volume superblock.
The volume Recovery was formatted by newfs_apfs (748.1.46) and last modified by apfs_kext (1677.81.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking the extent ref tree.
Checking the fsroot tree.
Checking volume.
Checking the APFS volume superblock.
The volume VM was formatted by newfs_apfs (748.1.46) and last modified by apfs_kext (1677.81.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking the extent ref tree.
Checking the fsroot tree.
Checking volume.
Checking the APFS volume superblock.
The volume Macintosh HD - Data was formatted by diskmanagementd (1677.60.23) and last modified by apfs_kext (1677.81.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking the extent ref tree.
Checking the fsroot tree.
Checking volume.
Checking the APFS volume superblock.
The volume Update was formatted by com.apple.Mobile (1677.50.1) and last modified by apfs_kext (1677.81.1).
Checking the object map.
Checking the snapshot metadata tree.
Checking the snapshot metadata.
Checking the extent ref tree.
Checking the fsroot tree.
Verifying allocated space.
The volume /dev/disk0s2 appears to be OK.
Storage system check exit code is 0.
Shrinking APFS Physical Store disk0s2 from 250.685.575.168 to 135.780.749.312 bytes
Shrinking APFS data structures
APFS Container Resize error code is 49187
A problem occurred while resizing APFS Container structures. : (-69606)
Operation failed…”