void GetActivities ( const int64 FirstActivityIdToFetch, const int64 MaxNumActivities, [TMap](API\Runtime\Core\Containers\TMap)< [FGuid](API\Runtime\Core\Misc\FGuid), [FConcertClientInfo](API\Plugins\Concert\FConcertClientInfo) > & OutEndpointClientInfoMap, [TArray](API\Runtime\Core\Containers\TArray)< [FConcertSessionActivity](API\Plugins\ConcertSyncCore\FConcertSessionActivity) > & OutActivities ) const