Well happily it looks like I solved my issue on my own  I'm not sure which one yet, but a computer that previously wouldn't work, works when I don't run GPO on it. So that's for sure the issue i have.  Thanks anyways  
Hello !  I have had quite a head scratcher... I recently started to use Dell Command Configure to create an EXE allowing me to modify (and basicaly get the same in my hole computer parc) Installed in a computer, and created it. Tested it on the computer, and simply doesn't work, getting this return code: Vendor Software Return Code: 1Name of Exit Code: Attempt to read write-only parameter.Exit Code set to: 0 (0x0) I couldn't really find much about that return code (but later was able to ge the same return code when i wouldn't type the bios password).  I know I have the right password, because i'm able to go on the bios on this computer.  I know the same ".exe" works fine as i have use it on other models.  I tried the same ".exe" on another computer, with the same model, and i get the same return code (return code 1).  I have compared bios settings from a working one, and a not working on, and i'm almost 100% sure that it's the same (but might be missing something).  Does anyone has an idea on what the issue could be ?  Working computer models are precision 3431 & 3430.  Models that caused me issues is Optiplex 3070 (we also have 3060 but am not able to test it yet). If more information is required I can probably get that !
Dell command configure