No, duct tape is not microwave safe. Duct tape is typically made with a combination of materials, including a fabric or plastic backing and an adhesive coating. When exposed to microwave radiation, the adhesive and backing can heat up and release potentially harmful fumes or even catch fire.
Using duct tape in the microwave can be dangerous and may damage the microwave, cause a fire, or create health risks due to the release of toxic substances.
If you need to repair or seal something for microwave use, make sure to use microwave-safe materials explicitly designed for such purposes. There are microwave-safe tapes and covers available that are designed to withstand the heat and radiation from microwave ovens without posing a safety risk. Always follow the manufacturer's instructions and safety guidelines for any products used in the microwave.