some phones have got a USB Sharing and this feature must be enabled at them. Try search that. Maybe you first share usb hotspot to some PC first ?
MikroTik can detect that as Ethernet emulation and he detect it or not.
If not then you can only do a supout.rif and send that diagnostic file to support@mikrotik.com.
We at forum can help with normal stuff, not if some not-compability stuff exist.