This option is available at the "Enhanced" and "Maximum" domain security levels.
With this option enabled, you will receive SMS notifications to the phone number specified in the settings about the following actions:
To set up and enable the option:
1. In your personal account, go to the "Active services - Domains" section.
2. Select the domain for which the "Enhanced" or "Maximum" security level is active.
3. Go to the "Security" tab.
4. Go to the "Urgent SMS notifications about settings changes" option and click "Settings".
5. Specify the number to receive SMS messages and enter the code that will be sent to this number for confirmation. Click "Done".
6. Click "Save".