Blink with & without carrier

I am running the Blink example with and without the MKR IoT carrier. When the MKR WiFi 1010 board is NOT connected to the carrier, the LED next to 5V pin blinks as expected. However, when the board is connected to the carrier, the LED next to 5V pin never blinks and stays off. Is there a problem with my carrier?? Also, in the the MKR WiFi 1010 which LED_BUILTIN is connected to pin 6, the one next to pin 5V or the one to the side of A6?? Thanks. AA

https://docs.arduino.cc/tutorials/mkr-iot-carrier/mkr-iot-carrier-01-technical-reference/

"... a Micro-B USB cable. This also provides power to the board, as indicated by the LED..."

There is no explanation on the datasheet for the behavior I described: "when the (MKR WiFi 1010) board is connected to the carrier, the LED next to 5V pin never blinks and stays off", it only blinks when the the (MKR WiFi 1010) board is not connected to the carrier.

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