Using braintree SDK: PayPal transaction always gets declined with error "2046 : TRANSACTION_REFUSED"

[maddm]

I'm trying to integrate Braintree SDK into my web application, in order to accept CC and PayPal payments, using the Drop-in UI
(https://developers.braintreepayments.com/guides/drop-in/setup-and-integration/javascript/v3)

I'm currently testing with the Braintree Sandbox enviornment and I've linked it to my PayPal Sandbox business account.

When paying through PayPal (through the gateway.transaction.sale() call) I cannot seem able to make the transaction succeed! No matter what amount I use or what Sandbox user account I use, the transaction gets always declined. In the response payload there's not much data to go with, just these info (I'm including only the relevant data):

{
  message: "Declined",
  transaction: {
    status: "processor_declined",
    processorResponseCode: "2046",
    processorResponseText: "Declined",
    additionalProcessorResponse: "2046 : TRANSACTION_REFUSED"
  }
}

I'm out of ideas. 
The Braintree testing guide seems to only focus on Credit Card transactions, so I'm unsure on how I am supposed to proceed in order to test PayPal integration: 

(https://developers.braintreepayments.com/reference/general/testing/node) 

Does anyone have any idea or advice?

[GeorgeAbadier]

I was having the same problem from couple hours actually  I was one of the ten that signed me too but I contact with Braintree to get help and they really helped me this the problem and how to be solved