> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# XblMultiplayerManagerJoinLobby

> XblMultiplayerManagerJoinLobby

# XblMultiplayerManagerJoinLobby

Joins an XBOX user to a lobby session.

## Syntax

```cpp theme={null}
HRESULT XblMultiplayerManagerJoinLobby(  
         const char* handleId,  
         XblUserHandle user  
)  
```

### Parameters

*handleId*   \_In\_z\_\
Type: char\*

The activity handle for the lobby session.

*user*   \_In\_\
Type: XblUserHandle

The user handle of the user joining the lobby session.

### Return value

Type: HRESULT

HRESULT return code for this API operation.

## Remarks

This function joins the XBOX user specified in *user* to the lobby session specified in *handleId*. The activity handle for the lobby session is typically retrieved either from a game invite or from the `HandleId` value of another user's [XblMultiplayerActivityDetails](/reference/live/xsapi-c/multiplayer_c/structs/xblmultiplayeractivitydetails), by calling [XblMultiplayerGetActivitiesForUsersAsync](/reference/live/xsapi-c/multiplayer_c/functions/xblmultiplayergetactivitiesforusersasync). For more information about multiplayer activities, see [Activities](/services/xbox-services/multiplayer/mpa/concepts/live-mpa-activities). <br />The result of this function is delivered as a multiplayer event with an event type set to `XblMultiplayerEventType::JoinLobbyCompleted`. You can call [XblMultiplayerManagerDoWork](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerdowork) to retrieve multiplayer events.  <br />When attempting to join a lobby session, the service returns `HTTP_E_STATUS_BAD_REQUEST` if the server is full.  <br />After joining, you can set the properties for the lobby session by calling [XblMultiplayerManagerLobbySessionSetSynchronizedProperties](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessionsetsynchronizedproperties), or you can set the host for the lobby session by calling [XblMultiplayerManagerLobbySessionSetSynchronizedHost](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessionsetsynchronizedhost) if the lobby session doesn't already have a host.  <br />You can also send an invite to another user by calling either [XblMultiplayerManagerLobbySessionInviteUsers](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessioninviteusers) or [XblMultiplayerManagerLobbySessionInviteFriends](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessioninvitefriends). If you don't need a lobby session, and if you haven't added local users by calling [XblMultiplayerManagerLobbySessionAddLocalUser](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessionaddlocaluser), you can instead call [XblMultiplayerManagerJoinGame](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerjoingame) and specify the list of users to join the game.

## Requirements

**Header:** multiplayer\_manager\_c.h

**Library:** Microsoft.Xbox.Services.14x.GDK.C.lib

## Conceptual documentation

* [Receiving invites](/services/xbox-services/multiplayer/invites/how-to/live-invites-receive)

## See also

[multiplayer\_manager\_c](/reference/live/xsapi-c/multiplayer_manager_c/multiplayer_manager_c_members)\
[XblMultiplayerManagerJoinability](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerjoinability)\
[XblMultiplayerManagerJoinGameFromLobby](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerjoingamefromlobby)


## Related topics

- [XblMultiplayerManagerJoinGameFromLobby](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerjoingamefromlobby.md)
- [XblMultiplayerManagerLeaveGame](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerleavegame.md)
- [XblMultiplayerManagerLobbySessionInviteFriends](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessioninvitefriends.md)
- [XblMultiplayerManagerLobbySessionInviteUsers](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessioninviteusers.md)
- [XblMultiplayerManagerLobbySessionRemoveLocalUser](/reference/live/xsapi-c/multiplayer_manager_c/functions/xblmultiplayermanagerlobbysessionremovelocaluser.md)