question

If you want to invoke the Azure Function when a new player is created for a title, you should use the “player_added_title” event instead of “player_created” event. Because the former will be triggered once when a new title_player_account is created in each Title under a Studio, while the latter will only be triggered once when the master_player_account is created, and the master_player_account is only created once under a Studio.

So, I write an Azure Function to call UpdateUserReadOnlyData API to update the player read only data and set a Rule (without any conditions) with “player_added_title” to trigger the Function when a new player is created. Then I create hundreds of new players, and each of them has successfully update the read only data.

If your process is like this, since I can't reproduce your issue, you may check the Azure Portal to see if the Azure Function has been called and check the Data Explorer to see if the "player_triggered_action_executed_cloudscript" and "player_action_executed" events are generated but not shown in the real time PlayStream Monitor. If the Azure Function is not called, please provide us with your Title id and more untriggered players’ PlayFabId for investigation.