To start with, we need to check if a Menu item available for the service charge. If not. please be advised to set this up to be included in the earnings, refer below article for more info:
What are the different menu item types available?
Once a Menu item for Service charge is available, make sure it's not a part of any Qualification criteria which could exclude this from earnings. By default if it is not included in any QC, guest will be able to earn points for the service charge as well.
This should help you for the service charge setup.
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