Good news! This is typically an easy fix.
Step 1: Are you playing CS:GO? Because of its strict anti-cheats, you'll likely need to use Display Capture. If you're not playing CS:GO, proceed to the next step.
Step 2: Make sure your app is running as administrator. To do this, close your app using task manager (ctrl + alt + delete), then right-click the Lowkey app icon on your desktop and click "run as administrator." Verify that it worked by clicking the lightbulb icon on the dashboard.
Step 3: Type "graphics settings" into the search bar by your Windows start menu and click the shortcut that appears.
Step 4: Click the word "browse" underneath a dropdown menu that will say either "classic app" or "desktop app." (picture below)
Step 5: Paste the following file path into the bar at the top of the window that appears. (Note: Do NOT paste this into the search bar. It will not work.)
%LOCALAPPDATA%\\Programs\\lowkey-desktop\\resources\\native\\osn
Then, select the obs64 file and hit "add."
Step 6: Click "options" on the new obs64 block and change the setting to "high performance."
Step 7: Go to Lowkey and hit ctrl + R to refresh the app. Try a test recording and see if it works.
Remove the modification to the obs64 file you performed in Step 6, then switch to Display Capture in the Lowkey settings menu.