Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Dear AndyWKL,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
Per your description, the issue happens with a Power Automate flow, Empty value from createdByUserDisplayName.
We'd love to help you, considering that we mainly focus on general and build-in queries in SharePoint, we're afraid we may have limited resource for Power Automate flow.
Meanwhile, since we have a dedicated channel Microsoft Power Automate Community for Power Automate flow, for you to be assisted properly, we sincerely recommend you go to that community and post a new thread. Members and engineers over there are proficient in the knowledge of flow customization queries. They will focus on the specific situation on your side and provide specific suggestions for you.
The reason we ask you to post a new thread is that in Microsoft Community we have limited resources and very little knowledge about Power Automate and in Microsoft Power Automate Community, you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction.
Thanks for your understanding and cooperation! We hope you stay safe and healthy always.
Sincerely,
Rhoda | Microsoft Community Moderator