post https://neon-loyalty-qa.spika.com/v3/api-docs/sorted/loyalty/v1//target-expressions//modify-tag-list/
This method provides a way of moving Members from SPIKA Target into NEON CDP by adding or removing the members to/from an existing Tag List. The method throws requires the step to be saved (state SAVED). It's not possible to copy members from a step that is invalid or currently being updated.