I’m trying to switch from Auth0 standard provider to a custom email provider (AWS). I have been following all the tutorials provided by Auth0 as well as AWS for setting up SES (Simple Email Service) and SNS (Simple Notification Service). I had the confirmation from AWS support that my account was removed from the sandbox, and that the process is now in place. However, I’m not yet able to send emails through this new provider. Every time I try sending a test mail, I get this error : “unable to verify the first certificate”. I don’t understand what that means. Can you please help me find a way to resolve this error ?