Sign in to your account and go to the Admin page. The UA id is reported in parentheses next to the site name:
Each time the tracking pixel is displayed, the specified UA account is notified by using the Measurement Protocol. Google Analytics tracks the visit in real time, receiving the attributes you defined in your tracking tag (title and path) along with user’s info (referral, location, device, user agent, etc). The Medium for your tracking pixels is set to “mbuto”.
Mbuto uses the new Universal Analytics api. This means that it won’t work if you have not yet upgraded your Google Analytics properties.
Sign in to your account and go to the Admin page. Select a property from the Property dropdown. If you see the following, you need to upgrade to Universal Analytics:
The Universal Analytics Upgrade is a process you can use to upgrade all of your classic Google Analytics properties into Universal Analytics properties without losing any data or changing your account settings. You can start the upgrade procedure by visiting the
Universal Analytics Upgrade Center
For more details, refer to google official FAQ