Level 1 Escalation for Response time elapse, not receiving alerts

Level 1 Escalation for Response time elapse, not receiving alerts

Hi, I have a question regarding the  " Level 1 Escalation for Response time elapse ".

I'm doing  a test with this feature. I have a SLA named "HIGH" with a Response time 20 minutes.
I attach an image with the setup for the Level 1 for Response Time.
Escalate To:  TicketOwner
Escalate Before:  5 minutes
No actions choose

The way I'm testing this is: Open a ticket with Priority High, assigned to me, status "ToDo". I leave the ticket on the status (ToDo) and I wait for the email 5 minutes before the time accomplish the 20 minutes. Nothing happens. I'm not receiving the email.

Once I receive the ticket, should I need to change the status from ToDo to Open?
Am I missing something on the setup?

Any assistance will be appreciated.

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