Hi RamH​,I checked with 'mboxDebug=console' parameter. In console I can see all the AT.js  methods are triggering. But still VEC header customized code executing after the page load only.Thanks,Hariharan S

Hi RamH​,Auto create mbox option is already enabled.... Still its not working

How can i check the Global auto-create mbox enabled or not?

Try adobe.target.version in  browser console. if you are seeing some version you are using At.js.

Hi All,I create a campaign in adobe target which needs to be set some window varaiable value before page load. It was working fine in mbox js. now my production site is migrated from Mbox.js to At.js.  After At.js its not executing before page load. is there any way to do that?.Thanks,Hariharan S