It indicates that the “MatchId” you passed is wrong, which looks like something like this:
2b163f4d-3975-482f-84d5-815ea5b2677f
It’s available from the GetMatchmakingTicket API call when a match is found: Matchmaking - Get Matchmaking Ticket (PlayFab Multiplayer) | Microsoft Docs. For more details about the flow of our Matchmaking System, please check out this doc: Matchmaking quickstart - PlayFab | Microsoft Docs
is "matchid" and "SesionId" same?
If you integrate PlayFab Matchmaking with PlayFab Multiplayer Servers as this doc describes: Integrating with PlayFab Multiplayer Servers - PlayFab | Microsoft Docs, then yes, the SessionId passed to the server will be equal to the MatchId for the match.
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