Don’t microwave brie. Ever. It turns into a rubbery, angry blob. The texture becomes sadness.
If you’re in a hurry, pop it in the oven at 350°F for five minutes. It will be warm, soft, and happy. Your microwave will be jealous.
One more warning: don’t overbake it. Brie that turns into a puddle is a tragedy. It should be molten, not a soup.