I have been working on building out services for the back-end which can be consumed by both my OfficeJS Add-ins and any other host. In researching different options to deploy those services I started to delve into using Docker. I have Visual Studio 2019 installed and I have “Container development tools” added.
Next I followed the steps here to this Quick Start. Except when I was trying to publish or even run in Docker for Windows I kept getting errors. When I tried to run Docker locally using Docker for Windows, I got an error that said “Docker for Windows is required” and the details said it could not start/find/access the “MobyLinuxVM.” It turns out, after a LOT of research, this was because it did not exist. It did not exist because I have Hyper-V default folder pointed to a removable drive that was not installed. 
The fix there was one of two things:
- Change the Hyper-V default folder to something on the C:\ drive.
- Install the removable drive.
So I chose #2, and then I had to uninstall and then reinstall Docker for Windows. Once I did this the “MobyLinuxVM” was there and once I launched Docker for Windows, it also started the VM.
Next, I was getting a very odd error CT1002 about an error with the Docker container service or something. I cannot remember the exact error now but in the details I kept seeing an error where it was attempting to mount folders in my user folder “c:\users\david.” I found this article on MSDN after a lot of digging:
https://blogs.msdn.microsoft.com/stevelasker/2016/06/14/configuring-docker-for-windows-volumes/
This essentially tells you to create a new user called DockerHost, set the password to never change/expire, and add the administrators group. Next you sign in with that account and try to access your personal users folder. For me that was “c:\users\david.” You get the permissions prompt and click “Continue.” Mine took over 5 minutes, but eventually I was able to open the folder and see everything. Then I logged out and this is the step that article forgets, you go into Docker for Windows, Settings, Shared Drives, and Reset Credentials. Then click the C:\ drive again and enter in the DockerHost username and password.
This resolved running in Docker for Windows, locally. Shortly after all this work, I found this page which might also work (adding your account to the docker-users group). I did not try this, but here is the article on that:
https://docs.microsoft.com/en-us/visualstudio/containers/troubleshooting-docker-errors?view=vs-2019
Finally, I am at the point where I want to publish to my Azure Container Registry in the cloud. This I still have not resolved. It gets most of the way done and then I get this error:
I am working on trying to get this sorted but have run out of time for the day and wanted to add what I did to solve everything else. I am exhausted and a tad frustrated. 
What I have learned from this experience is that “out of the box” most of this stuff does not work. Looking for help online I see lots of command line junkies throwing out complex scripts and esoteric answers. It is a really interesting community but it seems to come with a high barrier to entry. With Visual Studio embracing it and trying to get you started “easy” there are still too many speed bumps for most folks trying to delve in.
If anyone knows a better answer on this stuff, please let me know. And if you have any idea what the publish error is I am getting and can give me some pointers, I would GREATLY appreciate it.