This depends on what type of electric blanket you’re using.
You CAN use:
A heated throw or an electric overblanket. These should be placed over the top of your duvet, so they’ll never come into contact with your levitex foam.
You SHOULDN’T use:
An electric underblanket, mattress cover, or any electric blanket that goes under your body. This is because the thickness of your electric blanket – along with the wires inside.