A year ago I used Azure Trusted Signing to codesign FOSS software that I distribute for Windows. It was the cheapest way to give away free software on that platform.

A couple of months ago I needed to renew the certificate because it expired, and I ran into the same issue as the author here - verification failed, and they refused to accept any documentation I would give them. Very frustrating experience, especially since there no human support available at all, for a product I was willing to pay and use!

We ended up getting our certificate sources from https://signpath.org and have been grateful to them ever since.