Adds a player to a game session and creates a player session record. A game session must be in an
ACTIVE status, have a creation policy of
ALLOW_ALL, and have an open player slot before players can be added to the session.
To create a player session, specify a game session ID and player ID. If successful, the player is added to the game session and a new PlayerSession object is returned.
/// The game instance is currently full and cannot allow the requested player(s) to join.
/// Clients can retry such requests immediately or after a waiting period.
///
/// The service encountered an unrecoverable internal failure while processing the request.
/// Clients can retry such requests immediately or after a waiting period.
///
/// The requested operation would cause a conflict with the current state of a resource
/// associated with the request and/or the game instance. Resolve the conflict before
/// retrying.
///
/// One or more parameter values in the request are invalid. Correct the invalid parameter
/// values before retrying.
///
/// A service resource associated with the request could not be found. Clients should
/// not retry such requests.
///
/// The service is unable to resolve the routing for a particular alias because it has
/// a terminal
RoutingStrategy associated with it. The message returned in this
/// exception is the message defined in the routing strategy itself. Such requests should
/// only be retried if the routing strategy for the specified alias is modified.
///
/// The client failed authentication. Clients should not retry such requests.
///
