Authentication Failed

I’m using my regular FedEx account password. Does anyone know what I need to do?

Here is the debug response from FedEx:

stdClass Object
(
[HighestSeverity] => ERROR
[Notifications] => stdClass Object
(
[Severity] => ERROR
[Source] => prof
[Code] => 1000
[Message] => Authentication Failed
)

[TransactionDetail] => stdClass Object
(
[CustomerTransactionId] => *** WooCommerce Rate Request ***
)

[Version] => stdClass Object
(
[ServiceId] => crs
[Major] => 16
[Intermediate] => 0
[Minor] => 0
)

)

https://wordpress.org/plugins/fedex-woocommerce-shipping-method/