Unable to enter private playtest session – loading screen flashes, then everyone is returned to the lobby (project-specific)

Summary

When I launch a private playtest for one particular UEFN project, the session starts to load, the loading screen flickers once, and a few seconds later every player is sent back to the Fortnite lobby. Other projects on the same machines work normally.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

  1. Open the search bar in fortnite
  2. Enter our playtest code: 5069-6268-5257
  3. Press “Play” and wait

Expected Result

All queued players spawn inside the map after the loading screen finishes.

Observed Result

The loading screen appears for a couple of seconds, flickers briefly, and then every player is returned to the lobby instead of entering the map.

Platform(s)

windows

Island Code

5069-6268-5257

Video

Additional Notes

  • No warnings or errors appear in UEFN before launching the playtest.
  • Restarting Fortnite, verifying game files, and re-uploading the project did not help.
  • The issue seems user-specific and intermittent: on one day I could enter while a teammate could not, and vice versa. Now it hasn’t worked in a long time.
  • The normal “Launch session” works. I dont know if a release of this map will work because of the fact that the private playtest session doesn’t work. Which is very frustrating because we are working for almost a year actively on this project with around 50.000 Lines of custom verse code and we are almost finished.