Hello @sbeeker
UIFlow2 doesn't use API keys. (Only UIFlow1 used them.) Are you sure you installed UIFlow2 firmware onto your M5Stack
device?
Use M5Burner from here to install UIFlow2 firmware (as an example for M5Core2) then use your browser to go to UIFlow2.
[image: 1781279688656-m5burner_uiflow2.0_m5core2.png]
Thanks
Felix