Transfer only (skip AI) not working

Hi this documented feature doesn't seem to work: https://docs.vapi.ai/server-url/events#transfer-only-skip-ai

I've tried it a bunch of times, always an "unknown error". the status update shows the call being forwarded, but the audio always says "unknown error" and doesn't forward the call. I've tried with a few phone numbers, and these numbers are able to transfer during the call when the ai calls transferCall just fine.

Call ids:
019a3759-f1c6-7886-839e-e725dec1cbb7
019a3759-85f3-7007-9379-7f4db92d8540
019a3758-5b7d-7007-a283-2d1a759c9529
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