Arduino + ESP8266 Wifi Module not printing to Serial Monitor

Using Arduino Programming Questions
1

I want to use ESP8266 (ESP-01) wifi module to connect to firebase and I've followed this tutorial:

https://create.arduino.cc/projecthub/pulasthi-Narada/connecting-esp8266-to-firebase-to-send-receive-data-4adf66

but in the end, my module don't print anything in the serial monitor and even in my firebase. How to fix this?

2

I assume the program compiled, linked and uploaded to the ESP-01 OK
how is it now connected? does anything appear on the serial monitor
upload the code (using code tags)?
Edit: how did you program the device?

3

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