Appointments+ not sending email

I am facing a problem with Appointments+, no emails are sent to admin when a new appointment is made if I confirm the appointment from the plugin dashboard, the member gets the confirmation e-mail. On the logs I see

“Notification message sent to +++++@++++++.fr for appointment ID: 9”

But I didn’t get this notification.

Already tested an SMTP plugin, plugin conflict test, made no differences.

Can you help me?