TAS
Just saw your message:
"I have not been able to locate individuals with case numbers starting with IOE9xxx who are still awaiting their N400 interview since January 2024."
I think this matches me? Filed online, from outside US, March 2024, batch "IO9xxxx" and am waiting still waiting for an interview.
If this does match, I can create a new post for further discussion. Also happy to help if there is anything I can do about it.