- Feather ESP32 v2: https://www.adafruit.com/product/5400
- PCF8523 Real Time Clock Breakout Board - STEMMA QT / Qwiic: https://www.adafruit.com/product/5189
- Adafruit RTClib example for PCF8523, Examples->RTClib->pcf8523
- Adafruit v2.1.1 fork of RTClib
I suspect the problem may be related to the re-numbering of the I2C pins in the Feather ESP32 v2, but I don't know for sure. Where are the pins configured?