IrtcSetAlarm2() sets alarm 2 with minute resolution.

bool IrtcSetAlarm2(uint8_t mode, uint8_t dayOrDate = 1, uint8_t hour = 0, uint8_t minute = 0)

void setup() {
  if (!IrtcBegin()) return;
 
  // Trigger alarm 2 every day at 08:30:00.
  IrtcSetAlarm2(IRTC_ALARM2_MATCH_HOUR_MINUTE, 1, 8, 30);
  IrtcAlarmEnable(2, true);
}
 
void loop() {
}

Run each device's corresponding Begin command first. Check I²C addresses and pin sharing; if the bool return value is false, inspect wiring and power.

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