LTC3780+AD5174

Hello! I make a charger for assembling 6S using LTC3780 and MCU STM32. To change the output voltage of the LTC3780, I use a digital rheostat AD5174. Part of the circuit with LTC3780 and AD5174 attached. In this form, this circuit does not work: the output voltage does not change. Individually, the digital rheostat is controlled (checked by deleting it from the circuit), the LTC3780 itself works as it should (connected a mechanical potentiometer instead of the AD5174 and the calculated value of the output voltage corresponds to the actually measured). Why don't LTC3780 and AD5174 work together?