@david wrafter ,
Thank you for reaching out to the Microsoft Q&A platform. Happy to answer your question.
Sometimes, you will get this error "'invoices are only available for billing accounts billing profiles and pay as you go subscriptions. please change to a supported scope'." if you are in the wrong directory. So, kindly click on www.portal.azure.com, then sign in using the email id. Once logged in, confirm that you are logged in to your Directory, to do so, at the top right-hand corner, kindly click on your email ID, and from the drop-down, select switch directory and select your directory. Once the directory switch is completed, search for Cost Management + Billing. Select subscription
Please suggest if you still facing the problem post performing the above recommendations. Happy to assist you further.
Thanks.