@Rob Brown, Thanks for posting in Q&A. From your description, it seems you are doing Autopilot pre-provisioning. And one app is failed to install.
For the log you provided, the error is normal because during device setup phase, user is not logging. For our issue, I think we need to look into the IME log to see which app is failed. unassign this app to the device group and see if the Autopilot pre-provisioning can complete. To analysis IME log, here is a link with the detailed steps for your reference:
https://www.anoopcnair.com/intune-win32-app-troubleshooting/
Note: Non-Microsoft link, just for the reference.
Also, if you want help to analysis IME log, with Q&A limitation, you can consider open case to get help on it. Here is a link with the steps to open case for your reference:
https://learn.microsoft.com/en-us/mem/get-support
Hope the above information can help.
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