No power on USB port of GL.iNet GL-MT300N-V2

Hi there

I have a GL.iNet GL-MT300N-V2 and try to connect a LTE USB stick for tethering. As it seems there is no power on the USB port. I also connected my smartphone with the same result.
The router is currently running in repeater mode, I already downloaded the latest update, etc…
Is this supposed to be a hardware failure? Or is there some software setting I have to change?