[Amazon Fraud Detector] "Unable to complete your request due to an unexpected error. Please try again." while setting up variables in an event.

In Amazon Fraud Detector, I have created the following variables:

Variable name	Data type	Variable type	Source
address_line_one	String	SHIPPING_ADDRESS_L1	Event
address_line_two	String	SHIPPING_ADDRESS_L2	Event
card_auth_code	String	AUTH_CODE	Event
card_brand	String	CARD_BRAND	Event
card_cvv_result	String	CVV_RESULT	Event
card_expiry_month	String	CARD_EXPIRY_MONTH	Event
card_expiry_year	String	CARD_EXPIRY_YEAR	Event
card_last_four	String	CARD_LAST4	Event
channel	String	CHANNEL	Event
city	String	SHIPPING_CITY	Event
country	String	SHIPPING_COUNTRY	Event
currency	String	CURRENCY_CODE	Event
email_address	String	EMAIL_ADDRESS	Event
ip_address	String	IP_ADDRESS	Event
name	String	SHIPPING_NAME	Event
order_id	String	ORDER_ID	Event
payment_type	String	PAYMENT_TYPE	Event
phone_number	String	SHIPPING_PHONE	Event
state	String	SHIPPING_STATE	Event
total_amount	Float	PRICE	Event
transaction_status	String	TRANSACTION_STATUS	Event
user_agent	String	USERAGENT	Event
zip	String	SHIPPING_ZIP	Event

I then try to create an Event that uses those variables. It doesn't matter if I import from a CSV file on an S3 bucket, or if I select them manually, I get the following error every time: "Unable to complete your request due to an unexpected error. Please try again."

Inspecting the request, I see:

POST https://frauddetector.us-east-1.amazonaws.com/ 500
	message: "Unable to complete your request due to an unexpected error. Please try again."
	retryAfterSeconds: 0
	__type: "InternalServerException"

I have narrowed it down to the following variables. When they are removed, the Event is successfully created:

Variable name	Data type	Variable type	Source
channel	String	CHANNEL	Event
transaction_status	String	TRANSACTION_STATUS	Event
card_brand	String	CARD_BRAND	Event
card_cvv_result	String	CVV_RESULT	Event
card_expiry_month	String	CARD_EXPIRY_MONTH	Event
card_expiry_year	String	CARD_EXPIRY_YEAR	Event
card_last_four	String	CARD_LAST4	Event

Even though I can proceed with my model and detector without these variables, I would like them for better fraud detection.

To be clear, I have tried:

• creating the variables manually, and via importing a CSV file through "Events".
• multiple regions and S3 buckets
• multiple browsers
• multiple devices (in different countries!)

This certainly seems like an AWS issue rather than an issue with my home setup.

Has anyone encountered this before or would have any clue why this might be happening?