I see a couple of people have the same issue here. I'll give mine as well to hopefully get this resolved soon.
Currently I have two accounts I've created, one which is my main account and another that is a service account. Both accounts have same level of access for powerapps and power automate. I have recreated my same instant flow and office scripts on the service account. Completely identical besides file locations. So far it runs through the process fine untill its hits the run script part. Which confuses me because its a scripts on one drive that the service account created and has access to. I was able to open a excel book and run it without any issues and it can see the script in power automate side. My main account instant flow can run without any issues. They are exact copies of each other so are the office scripts. Not sure what could be different with these two accounts.
