QBO Custom Fields in Pipelines

Hey all,

Running into an issue when trying to assign any data to created custom fields in QBO via a Create or Update Estimate step in Pipelines. No matter what I try to pass, it errors out on me with the following:

Remote service reported an error: Property Name:failed to parse json object; a property specified is unsupported or invalid intuit_tid: 1-6785955b-5d1bbc6935b5cc642b5ee13e

Now, there is no Property Name on an Estimate in QBO, and none of the custom fields set up are titled Property Name. All I've been trying to do is figure out which of the 3 custom fields are which, since the names of the field don't show up in Pipelines and I only want to pass information to one.

Any idea what restrictions there are on utilizing these custom fields here?