How to set UNIQUE_DISPLAY_NAME_ENABLED to true

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Hi everyone,
I’m trying to implement display name uniqueness in my game.
I’m using headless accounts with ability to change display name by using user.Update SDK method.
If I’m adding UniqueDisplayName field into updateUserRequest parameter it does not apply, in response I’m getting updateUserRequest as null. So I’ve found that there is existing some config value: UNIQUE_DISPLAY_NAME_ENABLED, but I have no idea how to set it to true. I’ve only found Get methods in SDK.