Clipper LTE - Unable to communicate

Hi, I have a Clipper LTE hat. Have followed all the instructions and i’m still unable to communicate via Minicom. If i open minicom and type “at” nothing happens.

I have tried
minicom -b 115200 -D /dev/ttyAMA0
and
minicom -b 115200 -D /dev/ttyS0

Both are listed when i run ls /dev/tty*

I have the hat on both a RPI4 and a Zero2W

Can anyone help ?