Players can't join our published island

Update:
I have rewritten our tycoon from the logic from Team Index + Dynamic, to now FFA.
It has not resolved the problem unfortunately.

If epic wants to debug this, you will need at least 6 clients to reproduce it, if you join with like 3-4 users there will not be an issue.
After 5th, our 6th wasn’t able to join, and after that the whole lobby was ‘glitched’ even when more people left (until 1 was left over) no one else could join again.

matchmakignattempt1.txt (1.5 MB)
attached log of this occurance.

We have spend over 3 months full time development on this Tycoon, for now we have delisted it since no one is able to join. We would highly appreciate any support to help resolve this matter.

EDIT:
This is old information, the bug is still there, but we were not sure about reproducing steps.
The reproduce steps are correctly outlined here: [CRITICAL] Tycoon Unjoinable “Network Connection Lost” After 15min – Matchmaking Still Sends Players - #8 by thrax207