@James Millard,Thanks for posting in Q&A.
For your issue, since I am not familiar with Power BI and Microsoft AppSource, it is suggested that you contact Microsoft AppSource support to get more help.
https://learn.microsoft.com/en-us/marketplace/get-support
Thanks for your understanding.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.