I have been trying to apply the promo code but it says invalid. Why is that so?

I bought the new galaxy ultra s21. The YouTube videos are having glitches. How to resolve this

Let her glow #ford #focusst #st #fordperformance #uaestclub #uaestsociety #mk3focus #fordofinstagram #stnation #hothatch #thefordhub #fordfamily #dubai #cars #greenst #green #frontend #altayer #project500 #mydubai #carporn #carsofuae #carswithourlimt...

I bought the s8 2 months ago. It gets heated up when I use the camera in the sun for more than 5 minutes and the camera turns off.It also got heated when it was kept in my jeans pocket.Any suggestions?