MATCHMAKING ERROR (#1): Unknown Error. Maybe try again?

Summary

Matchmaking Error (#1) when trying to enter my published map “EIZO PARTY ROYAL” (code: 7331-9500-1909).

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Matchmaking

Steps to Reproduce

Open Fortnite.

Enter the map code: 7331-9500-1909.

Click “Play” to join the island.

Error message appears: “MATCHMAKING ERROR (#1): Unknown Error. Maybe try again?”

Expected Result

Players should be able to join and play the map normally.

Observed Result

Players receive the matchmaking error message and cannot enter the map.

Platform(s)

ALL

Island Code

7331-9500-1909

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Additional Notes

Issue has persisted for over 3 months.

I tried changing DNS, different internet connections, PC and PlayStation, converting the island to UEFN, and even rebuilding the map on a new island with a new code — problem still exists.

The issue affects not only me but all players who attempt to enter the map.