Currently, UXbuilder doesn't list all UX services present in the environment. By switching on the browser network console, I've observed that it gets first 100 services in alphabetical order (which includes automation services, presentation flows, sampling services, UX Services). So, if my UX service name is not listed in the first 100 services, it wouldn't show it up in Service Configuration of UXbuilder in 22.1. Not sure if this is fixed in later versions.
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