UEFN Session Launch Suddenly Started Failing

lantram
Fri, 17 Apr 2026 19:14:24 +0000
Issues and Bug Reporting

Summary

I’m encountering a session launch failure on a project I’ve been working on for weeks. The project was working successfully all morning, but it suddenly began failing every time I try to launch a session.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Stability

Steps to Reproduce

1. Launch UEFN

2. Open project

3. Rebuild (for good measure)

4. Click Start Session

5. Session launch fails with match.session_unavailable.402

Expected Result

Session launches into Fortnite normally.

Observed Result

UEFN fails matchmaking/session creation every time.

Platform(s)

Windows 11 PC

Upload an image

5 posts - 3 participants