I don’t have a Here3, but I ran on a similar issue with Here2 running on CANBUS. Take a look at this thread HERE 2 Pixhawk CAN issue (Solved) It might not solve your issue but it will help you understand the reason why it wont work. I recommend you get your hands on a HERE2 and work from there, Emlid is a great system, they just need to update the way the system works with the new CANbus protocol.
Happy Holidays!
Sorry for the so late reply, hopefully you have solved your issue.