Set out your mouse to warm to room temp. In a ziplock bag, place in hot water for about 15 min. ( if you are using the hot water method). With tongs hold the mouse by the scruff of the neck (this mimics a mouse). Just "slightly" twitch the mouse. A dangle or big movements may startle a new beep.
Make sure your hot side is 90, cool side hide 80 and ambient (overall temp) 80. If you have a heat mat or UTH it must be regulated by a thermostat. This is NOT an option.
Pretty common for for them not to eat the first round. This is when we make sure your husbandry is correct.