Add FAQ for Common Error in HubSpot Cloud Mode

[courtneyga]

Proposed changes

Customers who use HubSpot Cloud Mode and have an “Upsert Contact” mapping and “CBE” mapping, receive a contact already exists error with two other responses, see below:

Response 1:

"category": "EXPIRED_AUTHENTICATION",
"message": "The OAuth token used to make this call expired 7 second(s) ago.",
"statusCode": 401,
"statusMessage": "Unauthorized"

Reason for Error: Because the token was expired on the first request, we refreshed the token and then made the request again, see below.

Response 2:

"message": "resource not found",
"statusCode": 404,
"statusMessage": "Not Found"

Reason for Error: On this request, the contact was not found, so we then proceeded with the second request to attempt to create the contact. 

Response 3:

"category": "CONFLICT",
"message": "Contact already exists. Existing ID: 11430351",
"statusCode": 409,
"statusMessage": "Conflict"

Reason for Error: This final request failed because of a Conflict error stating that the contact already exists. This is somewhat counterintuitive, being that when we first tried to update an existing contact, the response indicated that the contact did not exist. Read more from HubSpot here.

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