Subdomains multisite usage

I'm trying to make this work with WP Ultimo multisite & Subdomains, to map domains via API but can't make it work. Is there a tutorial perhaps or can I get in touch with someone who can set this up for us?

No files, tests, or entry points are named. Start by reviewing the repository documentation and REST API usage for WP Ultimo multisite with subdomains; done means documenting a supported setup path or clearly recording the limitation and required configuration.

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