Hello. In our Facebook Instant Game, if a user makes a purchase using purchaseAsync but does not consume this purchase, getPurchasesAsync consistently returns an UNKNOWN ERROR.

{
    "code": "UNKNOWN"
}

At the network level, a request is made to https://graph.fb.gg/me/purchases?access_token=...... and the response received is a Graph API error:

{
    "error": {
        "message": "An unknown error has occurred.",
        "type": "OAuthException",
        "code": 1,
        "fbtrace_id": "AACOqCzsG_HGiU1TGxtnWO_"
    }
}

This error message is not very helpful. Does anyone know how we can resolve this issue?