If the user you use for your connections have Admin rights it should be fine. Make sure to double check that, if you haven't already 🙂
If that is in order, you could try setting UIFlowService.exe in your PAD folder (usually found in C:\Program Files (x86)\Power Automate Desktop) to run as admin. Haven't tried this myself, but might be worth a shot. Make sure to reboot the Machine afterwards.
I had issues capturing UI elements of an Oracle application when running unattended, and I sorted this by setting
Microsoft.Flow.RPA.UIFlowService.ScreenDefaultResolutionEnabled to true
In the UIFlowService.exe.config - might also be worth a shot.