New accounts - problem sending out verification emails

Looks like Auth0 cannot send out verification emails. New user will register and I see in the logs following:
“error”: “Email address is not verified. The following identities failed the check in region US-EAST-1: new_useremail@domain.org

The message clearly states that email is not verified yet and it is true but that’s the whole point of this email - to verify user’s email address !!! How can I fix it ? I use amazon AWS to send out emails from Auth0.
Thanks

Can you post the entire log entry please. What log entry type / event is this exactly from? (My question is basically: what’s the event code, referring to https://auth0.com/docs/logs/references/log-event-type-codes)

Any error logged in AWS’s mail service?