Oh... It's uart_id not just id

esphome/device_packages/vindriktning-air-monitor.yaml

@@ -3,10 +3,6 @@ esp32:
   framework:
     type: esp-idf
 
-i2c:
-  sda: GPIO8
-  scl: GPIO9
-
 uart:
   - id: uart_mhz19
     rx_pin: GPIO21
@@ -16,6 +12,10 @@ uart:
     rx_pin: GPIO10
     baud_rate: 9600
 
+i2c:
+  sda: GPIO8
+  scl: GPIO9
+
 sensor:
   - platform: bme280_i2c
     temperature:
@@ -33,9 +33,9 @@ sensor:
     co2:
       name: "${friendly_devicename} Co2 Concentratie"
     update_interval: 60s
-    id: uart_mhz19
+    uart_id: uart_mhz19
   - platform: pm1006
-    id: uart_pm1006
+    uart_id: uart_pm1006
     pm_2_5:
       name: "${friendly_devicename} 2.5µm Concentratie"
       id: pm25