I have managed to resolve my issue, without fully understanding the cause. I found a post about a similar issue here, but did not fit my circumstance precisely, as I had only ever logged on to my machine as a single user.
The post showed how to delete the container, but I couldn’t do this either as it said the container didn’t exist. What it did though was prompt me to run the command prompt as an Administrator, which I had not done previously. This allowed me to uninstall and re-install the certificate, and both versions of the project now build successfully.
My assumption is that somehow the certificate had initially been installed (by me) under a different user than the one I tried to install with the second time, though I don’t know why this would be, as I have only ever logged on to the machine as a single user. It remains something of a mystery to me.
Summary:
- Start the developer command prompt as administrator, otherwise you’ll get a misleading error saying the container doesn’t exist.
- Run sn -d VS_KEY_XXXXXXXXXXX to remove the old key.
- You should now be able to reinstall the certificate.