Custom Email as stopped working - AWS SES

Hi,

Im trying to get custom emails working using AWS SES. This was working until recently however, we are not getting the following log error when trying to test / or send

{
"date": "2022-09-13T16:06:41.633Z",
"type": "fn",
"description": "To: someone@ourcompany.co.uk",
"connection_id": "",
"details": {
"email_type": "try_provider_configuration_email",
"to": "someone@ourcompany.co.uk",
"error": "The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details."
},
"log_id": "90020220913160646833151741876095701589118590143275466818",
"_id": "90020220913160646833151741876095701589118590143275466818",
"isMobile": false,
"user_agent": "Other 0.0.0 / Other 0.0.0",
"id": "90020220913160646833151741876095701589118590143275466818"
}

I can confirm that the AWS Access and Secret keys are valid as they work for other email processes outside Auth0. Can you advise please?

Kind regards