The problem can be resolved on Mikrotik routers by upgrading to the RouterOS to v 7.1. This is still in beta.
Hope this helps
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This video demonstrates that the Android USB Tethering function of OnePlus does not work unlike other Android devices.
This video shows the correct behaviour of Samsung Phones vs OnePlus.
Tell OnePlus to fix this:
Twitter: @OnePlus Support
Support Website: https://www.oneplus.com/global/support