Thank you all for your help.

I removed the pin from my sim card and now it works :)

Hi all,
i ordered a bunch of units to try out some things.

When i connect the Cat-M or the CatM+GNSS to my Core2 oder StickCPlus it does not work with UIFLOW

For testing, i added a Label to the screen. When i push it to the device, the label shows.
Then i add the Unit. E.g. the Cat-M Modul to the device, in UIFLOW and connect the cable.
When i push the code to the device ( no additional Blocks added yet, just defined the Unit ), the screen stays blank, and the label is not displayed.

This behaviour is the same for the Cat-M unit, or the CatM+GNSS Unit.

Any ideas what might be wrong? I have connected the Core2 via usb to a additional power source, just to be sure.

I am talking about this two units:
https://shop.m5stack.com/collections/m5-sensor/products/sim7080g-cat-m-nb-iot-unit
or
https://shop.m5stack.com/collections/m5-sensor/products/sim7080g-cat-m-nb-iot-gnss-unit-with-telec-antenna