Thank you for posting here.
As you know, the compatibility of Android device with an external USB device such as the Ethernet adapter is device dependent. In this USB2-OTGE100 Ethernet adapter’s case, if the smartphone is running the device driver of AX88772 chip set, it can work. Otherwise there isn’t any way to make it work since Android doesn’t allow users to install any device driver.
Unfortunately we have not tested nor heard about the new Motorola Moto Force Z with the USB2-OTGE100 yet. We do not know if the phone is compatible or not.
But as far as we know, Motorola has been very good at supporting this adapter, with their legacy smartphones with a microUSB port. I personally think it is highly possible that the Moto Force Z has built in the device driver. But in that case, we would suspect either:
The device driver may have problem with the brand-new device. This happens with the Nexus Pixel phone, too. In that case, applying the latest update to Android could be helping. If something wrong happened with the device driver of Android, that is the only way to fix the issue. (But we are not sure if the fix has been or will be delivered or not.)
I am a bit carious what kind of “Micro-B to Micro-C adapter” you are using. That kind of adapter could be the issue.
We have an USB 3.0 Ethernet adapter with a USB-C connector, but we are not sure if it works with the Motorola Moto Force Z phone or not, neither.
Could you contact us directly so that we could help you further? I have a few ideas to figure out which Ethernet adapter could be working.
The email address is firstname.lastname@example.org.