This is coming in late - you've likely resolved this by now & may be using it for some time. But just in case, I found a discussion thread in the RPi forum where some additional details on the [OTG support provided in RPi4](https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=243966&sid=c6f777e0e7baada2ceb2b91da883d17f) were provided. Also, [this "how-to guide"](https://dev.webonomic.nl/4-ways-to-connect-your-raspberry-pi-4-to-the-internet) may be useful in getting this feature working on your RPi 4. These may be useful, so I'm posting them here.