Hey @PeCour certains things which cause this problem.Try sending a test email from the Admin > Settings > Email configuration page in UiPath to see if emails can be sent successfully through the configured SMTP server.
Some organizations have limits on the number of emails that can be sent in a certain time period. Check with your IT department to see if there are any restrictions or firewalls blocking outgoing emails from UiPath.
Check the Logs in UiPath Orchestrator to see if there are any errors related to email sending.
Ensure that email notifications are enabled for the right events (e.g., job success, failure, etc.).
cheers