For what it's worth, in my experience it was even worse with EV certs though - all the same steps including removing WHOIS privacy, plus some extra ones like voice phone number validation that had to be repeated every single year.

And then there were extra WTFs with the EV cert expiration being 365 days after an issue date which is several days before you actually receive the hardware token. Or one year they sent the hardware token fairly promptly, but forget to send the password needed to use it, and it took a week to get a response from support etc. Then again, Azure Trusted Signing has similar ridiculousness with billing being based on calendar months, with no proration for your first month even if you started at the end of the month... I mean it's just $10 but it really adds insult to injury after that signup gauntlet.

Anyway, I've heard that if your Azure Trusted Signing process gets stuck in limbo, it can be best to submit a different document, but I'm not sure if there's any alternative permitted for the DUNS step. That's especially annoying because trying to update outdated info with Dun & Bradstreet is problematic in my experience, i.e. their web forms just plain did not function properly.