Hello,
I have the same issue previously, i done whatever i can such as uninstalled and reinstalled the app and the driver.
Besides that, i tried removed KB5001391 but still it could not solve the problem.
Right now, there is no real solution, some users are lucky to get the DTS app working again.
What i had done is i factory reset the laptop once and then the DTS app worked until now even I updated till Windows 10 (20H2).