I've added a custom field called "Status updated". Then created an automation to populate that field with issue.updated whenever that field value is changed.
The trigger seems to work according to the logs but updating the field does not.
I've included a screenshot of my automation and pasted the output from the logs at the bottom. Is anyone able to see what I'm doing wrong here.
Note: I've tried using the custom field ID and the name of the field. Both give the same error.

Log output:
Edited issue successfully, however some of the set fields aren't available. Fields ignored:
Status updated (customfield_10193)
Unable to find any issue field values to edit: