I’m with the original software and with the firmware of the Brio updated;
Not using any software that is using camera output;
And the problem is: When i press to change the video input device with the Directional Arrows, it changes to Logitech Brio for like 1 microsecond and change it back to NO DEVICE OPEN every time…
I tried the Mixed Reality from the plugin LIV and it worked very well, but the MR from Unreal i think it fits better on my project, I really wanna use it 
Thank you so much for answer me, if you gotta something to bypass this problem, i will be so fu*ing happy, tyyy