Matchmaking closing wording is confusing to the player (Matchmaking Error #1 + repro)

Summary

When closing matchmaking and a player is trying to join a closed lobby, instead of the game telling them they are trying (and failing) to join a closed MM game, it instead saying “Failed to join, Matchmaking Error #1”. However, this may happen also in other cases where the player is trying to access a game in discovery and getting that message, so we cant distinguish what is happening and whether this issue is the same as this one (which shouldnt be a case, because why is discovery sending a player to a closed session).

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Matchmaking

Steps to Reproduce

Create a level that has a button that on activate will close the matchmaking on a rounds device.
Make the game max 2 players
Make a private code
Open Fortnite with 3 accounts

Scenario A
Have account A connect to the private code and press the button
Have account B trying to join the party of account A

Scenario B
Have account A and B connect to the private code and do nothing
Have account C try to join the party of account A or B

Expected Result

An error message showing the cause of the failed attempt is shown

Observed Result

An error message pops up “Failed to join matchmaking session - Matchmaking error #1

Platform(s)

PC

For better results, ideally test this with connection throttling to simulate a bad ping, it may reveal additional issues to this one.