AWS WorkMail can't send emails!

Hey, I'm trying to send emails with my newly created email account info@mydomain.com.

I'm always getting this email returned:

*Sending Email failed. Could not send email.

SubmitId: E5C4D5F784298A6BDD19AA964A874B40

Your administrator needs to give permissions to WorkMail to perform e-mail sending on your behalf. To give WorkMail sending permissions, follow the instructions here:

https://docs.aws.amazon.com/workmail/latest/adminguide/editing_domains.html*

The description in the link does not fit to the current UI, but I supposed I found the right place. So I created the following Policies related to the email account

{
  "Version": "2012-10-17",
  "Id": "ExampleAuthorizationPolicy",
  "Statement": [
    {
      "Sid": "AuthorizeAccount",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::AccountID:root"
      },
      "Action": [
        "ses:*",
        "ses:SendBounce",
        "ses:SendRawEmail"
      ],
      "Resource": "arn:aws:ses:eu-west-1:AccountID:identity/info@mydomain.com"
    }
  ]
}

• the domain in SES:

{
  "Version": "2012-10-17",
  "Id": "ExampleAuthorizationPolicy",
  "Statement": [
    {
      "Sid": "AuthorizeAccount",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::AccountID:root"
      },
      "Action": [
        "ses:*",
        "ses:SendBounce",
        "ses:SendRawEmail"
      ],
      "Resource": "arn:aws:ses:eu-west-1:AccountID:identity/mydomain.com"
    }
  ]
}

I'm running out of ideas why I still can't send emails from WorkMail.