I have a very simple flow - all it does is wait 600 sec.
This was created and run unattended overnight because the large files other flows generate do not have time to sync on onedrive before the machine logs out. The wait flow gives onedrive time to sync all the files that have been generated.
It was working until this week - it now fails when run unattended, but works when run in attended mode.
If I adjust the time to 60 seconds, it runs unattended but anything more than that fails.