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API setting custom fields

I need to set values for a few custom fields and am getting an error response from the API service. I'm able to use all of the other API calls with no problem, just setting a value to custom fields has an issue. I get this response with both PowerShell invoke-restrequst and in Postman:

"errorCode": "d729835050",
"message": "An error occurred. If this problem happens again, please contact customer support at and quote the error code."

The response code is 200 OK.


Trying different fields or computers doesn't help.


I've contacted LMI support first of course and have a ticket open but haven't gotten any word back from them as they have sent the ticket to their API team.


Has anyone else encountered or overcome this error?

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