Hello @bensonwhlee
I think you need to use the M5StamPLC library together with M5Unified and M5GFX libraries for it to work properly.
Please find an example here which works for me.
Edit: if you don't need M5StamPLC specific functions then it should be sufficient to add the following line to your setup code:
Wire.begin(2, 1, 400000U);Thanks
Felix