Hi, Adam.
Thanks for the request. Typically, API dimensions for ids are only available when the UI can export them (via the "Include IDs" option in the "Export" menu). If you run a report with "Yield Partner" in the UI, and then export it with ids, there is no extra column for YIELD_PARTNER_ID, which means our reporting infrastructure is not set up to handle this dimension.
If this should change and the dimension gets added to the UI, we'll work on getting it into the API as well. As with any API changes, follow
our blog for more updates.
Thanks,
Donovan McMurray, Ad Manager API Team

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