Email alert has been turned off due to an issue

I have tried to create an alert from a dashboard to my email.
Unfortunately, I got the next message to my email:
“ has been turned off due to an issue. View the dashboard to turn on the alert.”

These are the setting of the alert:

The calculated field that the alert is based on is that:

What could be the problem?

Eldad Levi

I think this is something that will need a support case.

I would recommend filing a case with AWS Support where we can dive into the details so that we can help you further. Here are the steps to open a support case. If your company has someone who manages your AWS account, you might not have direct access to AWS Support and will need to raise an internal ticket to your IT team or whomever manages your AWS account. They should be able to open an AWS Support case on your behalf. Hope this helps!