Failing batch surrogate key purge (invalid key)

Hi I'm currently getting a 400 Bad Request back with a message of "Batch surrogate key purge request has invalid surrogate key". I'm guessing I'm sending it an invalid key but I can't see which key is causing it to fail. I looked through the documentation and I can't find anything that actually mentions what the valid format for surrogate keys is. If you could point me in the right direction I'd appreciate it. Also, maybe you could add a feature so that the failure message includes the failing key(s).

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