How to get the sum of all user orders and assign a new group to him with a certain number of orders?

Question

1C-Bitrix

It is necessary to get the total number of user orders, and if orders are 6 or more, then assign a new group to him.
How to implement?
Found this option .
But for some reason it didn't work very well.

Answer 1

Obsolete events follow the link, they do not work by default, you need to enable the processing of obsolete events in the admin panel. What the documentation says here
It's better to use the new order save event, documentation accordingly here