Please check out this article Fix tethered shooting in Lightroom where we have documented possible causes and solutions of the problem you are facing.
Also, ensure that a card must be in the camera for tethering to work properly with this camera.
Let us know if that helps.
Yes I went through all of those steps. Still not working properly. Works fine with capture one but I would like to use lightroom.
1 person found this helpful
That did not work as well. Made it worse. When starting the tether it flashes on and off that it's reading the camera. Tether works perfectly fine in capture one so it's not the cable. Canon 5D mark iii works fine in lightroom. For whatever reason the 5D mark IV does not work with it. You should take this camera off the list of cameras that work with Lightroom.