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@Jeremy_Ledford – I have run into this issue and it had to do with the NULL values. If you have an Object Type defined, I believe it requires you to provide either a valid value, no value at all (ie - don’t pass “trackingNumber”: null, just omit “trackingNumber” entirely) or pass an empty string (if the field expects a string).
I could be wrong on this, but that’s what I seem to remember happening.