I have the following error from an automation rule

But how does one troubleshoot it? Why does it have to be rocket science?
I don't know in which ticket this happened, I don't know the user who caused it.. why is it so hard to include this data in the log? How can I find that?
I know why it's failing.. I have a user trying to create a ticket via automation in another project of which he's not a part of, I want to give him access, but I don't know who he is..