This issue seems to occur when the administrator rights are inconsistent between the Darktide.exe and Launcher.exe.
You may have enabled administrator rights for one, but not the other, at some point.
We recommend removing administrator rights for both Darktide.exe and Launcher.exe by:
- Navigate to
Steam\steamapps\common\Warhammer 40,000 DARKTIDE\binaries - Right-click Darktide.exe
- Select ‘Compatability’
- Untick the ‘Run this program as an administrator’ box
- Save your changes
- Attempt to launch Darktide as normal
NOTE: You may need to do the same for Launcher.exe, in Steam\steamapps\common\Warhammer 40,000 DARKTIDE\launcher
