Hi @Matthew Maxwell , validation criteria can be found here: https://learn.microsoft.com/en-us/azure/trusted-signing/quickstart?tabs=registerrp-portal%2Caccount-portal%2Corgvalidation%2Ccertificateprofile-portal%2Cdeleteresources-portal#create-an-identity-validation-request
If you follow this document it should help your validation pass, but if not please let me know. I'll have to look at what you're submitting. You can send me a private message here and I can help you out.
Please let me know if you have any questions and I can help you further.
If this answer helps you please mark "Accept Answer" so other users can reference it.
Thank you,
James