As per the comment.
JIRA Cloud Automation for JIRA forces the rule actor to be Automation app user, however, it's unclear where the permissions (or the account) exists for Automation app user.
My many slack notifications send 'functional' links that ask you to log in when you click them, but you can't give permissions (it just brings you back to the same page) because the Automation app user doesn't have an account, and you cannot use any other account.
Anyone else figured out where / how to enabled the links to work (that is, how do I give the rule actor permissions to at least Open the alert links I am sending?)