Zoho Projects API - Searching Projects by Custom Field

How can I search all projects by a custom field?

I can confirm that using the search_term parameter as documented here does not work for me:

My search term is "22424", which corresponds to a value in a custom field in the project ("Stock ID").

My GET:

This returns no results.

Any possible reason this would fail?

However, searches for terms contained in the name of the project do return results.

Thanks.

Marcus.

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