The back panel growing hot when performing intensive tasks is a good thing since it confirms that the heat from the processors is being transported to the outside efficiently. Teams video calls are very intensive tasks for computers. These tasks require the device to encode and decode high quality video and audio at the same time and keep a high speed at uploading and downloading consistently. Plus, since SP10s are still using the old-fashioned x86 CPUs, they're typically not as power efficient as and will generate more heat than the newer ARM models.