I'm sorry, the sample works!

The problem was that the RFID2 return a different chip ID and takes longer to initialize, and my microBlocks library didn't expect that.

Thanks for your fast response.

There is any Arduino sample code for RFID2?

The sample from the docs page it's for RC522 chip not for WS1850s

https://docs.m5stack.com/en/unit/rfid2

Thanks!