Marketpress issue with live mode - * 550006 - The application is not authorized for the user

I have tested the WPMU with MarketPress in sandbox mode (set to PayPal Chained Payment only).

Now I entered the PayPal live app ID and other things from paypal inside the network admin MakrtPress settings, and then entered a business paypal account email in sub-blog Marketpress' payment setting, it should work like it was in sandbox mode.

But when I tested the check out, I saw:

There was a problem connecting to PayPal to setup your purchase. Please try again.

* 550006 - The application is not authorized for the user

Any idea to debug this issue? What should I look into?

Thanks a lot in advance :slight_smile: