Scheduling and managing events using Outlook.com calendar
Hello Cath Turner,
Could you open one of those spam calendar entries and check whether it shows an organizer and buttons such as Accept, Tentative, or Decline?
If it does, it is likely a calendar invitation rather than an event automatically created from an email, so changing Events from email may not address it.
If it does not, and Outlook is creating the event from an ordinary email, then the Events from email setting is the relevant place to investigate.
That distinction would help narrow down why the options you found online are not appearing in your case.