Thanks for the report, sent this over to get looked at. If you could possibly do the following and provide us with your logs it would be very helpful. You can follow these steps:
- Have the issue occur ( ADS does not work)
- Exit the Fortnite Application.
- Navigate to C:\Users\\AppData\Local\FortniteGame\Saved\Logs.
- The AppData folder is hidden by default. If you are unable to see it, please use this Microsoft support article to view hidden folders.
- Zip your Logs folder and attach the zip file and send it over to us.
- You can use these Microsoft support steps to zip the folder on Windows.
It might be best to drop these in a dropbox file and link us or send a message on discord with the file attached