Thank you for the feedback, we are working on updating the Azure portal with pre reqs. However, the documentation has this under prerequisites before you even create an account:
https://learn.microsoft.com/en-us/azure/trusted-signing/quickstart
Unfortunately, there is no exception process and Trusted Signing is still in public preview, although with the restrictions of country being US/Canada and organizations need to have been incorporated for 3 or more years.