I have a Mavic Pro that no longer shows video on my attached phone (Androd Pixel 3XL).  It used to work just fine and has recently just stopped.  All the data shows up on the phone, but no video from the camera.  All the data/notes on the phone indicate everthing is fine (Gimbal Status, Vision Sensors, Gimbal Calibration, etc.)

Below are the troubleshooting steps I've taken with no luck:
1) Confirmed I have the latest firmware in both the drone and controller.
2) Downgraded the firmware in both units to the previous version (and upgradedd back).
3) Used a differenct USB cable to my phone, from both the USB micro and to the USB C on the bottom of the controller.
4) Recalibrated the gimbal.
5) Replaced the gimbal ribbon (not fun!)  ;-)

From sniffing around the web the last two things I can think of that I haven't done is to replace the Video Ribbon cable and/or the Lens.  Considering the prices, unless I get any feedback I'll probably try the video ribbon cable next.

What is strange, I've 'calibrated' the video camera from my desktop computer with the DJI Assistant 2, this is where there is dot pattern on my desktop screen and you systematically move the front (and bottom) of the Mavic Pro around the whole screen.  On the bottom left of this screen is the Sensor Status that show the image from the Mavic Pro and this shows the video image of the dots as I move around the screen just fine!  This indicates to me the camera must be working and the video ribbon cable must be good.

Does anyone have any ideas on my next course of action?  

Have you tried logging in using a different phone or tablet but with your original account. You seemed to have taken almost everything out of the equation but your phone and if the image showed up on your PC doing the calibration the phone was not part of that equation.

Yes, I tried a friends Apple phone with same results.