Unable to create new lead profile in a different partition through REST API for already existing lead in default partition

Question

Still figuring how the Partitions work on Marketo. We are looking for a way to create new users through REST API on a specific partition called "APAC" on our Marketo. Net new leads are being added just fine; however; those leads who are already in a default Partition with same email address are not being added into the "APAC" partition. 
 
Below is our JSON body:
 
{
"input": [
{"email":"test@test.com"}
],
"action":"createOrUpdate",
"partitionName":"APAC"
}

Here is the output we are seeing, but no change on Marketo.

{
    "requestId": "16835#17a61d9d767",
    "result": [
        {
            "id": 5571,
            "status": "updated"
        }
    ],
    "success": true
}

SanfordWhiteman · Accepted Answer

I don’t think you need a custom dedupe key, but you do need additional pre-check logic.

If you query first and see there’s already someone with a given email address, you can then insert a new lead by ID with the ID set to -1. Then change their email address.

Marketo doesn’t actually care if multiple records have the same email address (I wouldn’t exactly agree with the way Katja phrased it). Some, but not all, ways of creating leads will automatically dedupe on email address unless you set up a compound dedupe key with support. It‘s best to avoid this and only live within the default constraints.

Katja_Keesom · Answer

Unless you have implemented custom deduplication keys, Marketo will only ever accept the same email address once. From the below, I would expect your existing record to have been updated. So if you want the same email address to appear as two separate records in your two partition, you would need to instruct Marketo to set up partition id as a second dedup key in your instance.

Beware though, because allowing duplicates also has plenty of downsides.

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