Problem: Trying to provision OpenVPN Access Server from the Marketplace and get:
You cannot purchase reservation because required AAD tenant information is missing. Please ask your tenant admin to fill this form: https://aka.ms/orgprofile (Code: "AccountSetupError)"
Resolution: You need to use a paid subscription

Thanks for this post! The error message was not at all clear to me and the link was not helpful at all: https://aka.ms/orgprofile. I wasn't able to proceed through the login experience.
Glad I could help a fellow 20 yr + IT Professional.