I797c Notice of Action

I enterd U.S as a visitor with my candain passport my company just informed me that myH1B visa has been approved and they have my I797C now do I have to go back to POE to get it stamped or Ican carry on working.

appreciated

Does your new I-797C has an I-94 attached to it (at the bottom)? If not, then you need to go out of the United States and then re-enter on H1 to activate your status.
 
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