Players getting Network Connection Lost when joining public lobby

hi @thrax207 ,
Earlier posted a Matchmaking log.

Matchmaking Flow Summary: 

PVP TYCOON - 17s 429ms
Flow finished successfully

Parameters:
	Island: 
	MatchmakingGroup:
		thrax207 (Local) - Ready
		VastHorizonsFN - Not Ready
	Metadata:
		LinkId [Mnemonic=[9524-0220-6933] Version=[latest]] 
		WorldId [World [None] WorldName [None] WorldOwnerId [INVALID] IsJoinable [Unjoinable]] 
		ProductModes [None] 
		SessionId [Session Id [469433b576fb4466bb463eba93435cc5] Join Info [IslandJoinability [Joinable] SessionKey [B7641A61B8B6423AAD8C4FC934BC4A98]]] 
		Privacy [Fill] 
		Region [EU] 
		MatchmakingId [D09A31DA4B26D4BB943C3E8E951DAA3F]
	UnrankedSet [Invalid],
	UnrankedIslands [Mnemonic=[9524-0220-6933] Version=[6]],
	UnrankedFallback [**Invalid**],
	RankedSet [**Invalid**],
	RankedIslands [Empty],
	RankedFallback [**Invalid**],
	bGracefullyUpgraded [False],
	PlaylistName [NoPlaylist]
	
	Party Leader: VastHorizonsFN

Steps:
	Matchmaking Begin - Immediate - Success:
	Hidden Delay - Immediate - Success:
		No member uses the 'Matchmaking Delay' setting, continuing...
	Refresh DAD - Immediate - Success:
		UGC mode, no playlist update required
	Refresh MCP Profiles - 743ms - Success:
	Validity Checks - Immediate - Success:
	Preload Athena - Immediate - Success:
		No need to preload athena for this mode, discarding prior athena references
	QosUpdate - 1s 73ms - Success:
	Anticheat - 679ms - Success:
	Keychain Update - Immediate - Success:
	Install Game Features - Immediate - Success:
	Clear Caches - Immediate - Success:
	Clean Up Old Sessions - Immediate - Success:
		No Session Found When Cleaning Up Old Sessions
	Clean Up Old Console Sessions - Immediate - Success:
		Not on Console So No Need To Clean Up Old Conslole Sessions
	Request Reservation - 3s 773ms - Success:
		Joining existing session. SessionId [SessionId: 469433b576fb4466bb463eba93435cc5]
		Attempting to join VastHorizonsFN
		Joined VastHorizonsFN
	Request Moderator Permissions - Immediate - Success:
	Wait For World Session - Immediate - Success:
		No world set
	Find World Session - Immediate - Success:
		No world set
	Request World Token - Immediate - Success:
		No world token required
	Call Matchmaking Service - Immediate - Success:
		Joinable session so no need to request a session.
	Find Session - 299ms - Success:
		Succesfully Found Session [Id: 469433b576fb4466bb463eba93435cc5]. Local user number: 0. Ping: 9999ms
	Query Session Encryption Key - 233ms - Success:
		Querying encryption key for thrax207 (Primary player) with Id: MCP:1c72ad98d5894588974ce45b42e3f1b9
	Query User Session ID Tokens - 234ms - Success:
	Reserve Position Within Existing Session - Immediate - Success:
		Already reserved for full party before finding session
	Refresh Auth Tokens - Immediate - Success:
	Join Session - 265ms - Success:
		Player With Id [1c72ad98d5894588974ce45b42e3f1b9] Joined Session [GameSession]
	Download Content - 3s 827ms - Success:
		Starting Download
		Content Beacon Readiness Changed To: Server is generating manfiests for consumption by the client.
		Content Beacon Readiness Changed To: Server is generating manfiests for consumption by the client.
		Content Beacon Readiness Changed To: In the progress of mounting the content.
		Content Beacon Readiness Changed To: Client is up to date with server content.
		Content Beacon Disconnect Requested
		Content Beacon Readiness Changed To: Client is up to date with server content.
		Content Beacon Readiness Changed To: In the progress of disconnecting from the host.
	Wait For Server Initialization - 2s 265ms - Success:
	Wait For Non Local Party Members Before Travel - Immediate - Success:
		Island has joinable session. Not waiting for non local party members before travel
	Wait For Travel Animation To Complete - 4s 2ms - Success:
		Travel animation started
		Travel animation finished
	Loading Screen - 35ms - Success:
	Travel To Session - 1ms - Success:
		Starting travel for controller 0 to session GameSession
[2025.06.16-13.37.07:833][482]LogQos: [UQosRegionManager::RegisterQoSSettingsChangedDelegate] delegate was replaced
[2025.06.16-13.37.07:833][482]LogFortPlaytimeManager: [3e62] Unblocking idle states from source Matchmaking

You will see hightlighted as invalid

UnrankedFallback [Invalid],
RankedSet [Invalid],
RankedIslands [Empty],
RankedFallback [Invalid],
bGracefullyUpgraded [False],
PlaylistName [NoPlaylist]

For me there is something wrong.
Its not a Ranked
If its not a ranked game should should this be True or false not invalid?

UnrankedSet [Invalid],
UnrankedIslands [Mnemonic=[9524-0220-6933] Version=[6]],
UnrankedFallback [Invalid],

So if its an UnrankedIsland as it has a valid code
Why is UnrankedSet [Invalid] Should Invalid be something like True/ False or Empty.

Is there a Matchmaking parameter for setting Ranked or Unranked game?

Cannot see the parameters for above in the log any where