Agilex 7 interface with DDR4

Are you using a dev kit or a custom board? If it's a dev kit, you can select the board when creating the Quartus project and then generate the example design from the EMIF IP parameter editor. A GHRD project is for a particular device and dev kit, so if you are having issues with it, then you must not be using that dev kit. If you are not using a dev kit and this is your own custom board, you can (and should) still create an example design and use that for testing. You would still need to set location assignments for the I/O, but you can use Interface Planner for that or follow the guidelines in the IP user guide to manually create the assignments. This is all shown in the training I linked you to.

FYI: Rzq is for the OCT (on-chip termination) calibration so that must be connected to an Rzq pin with a resistor attached. Again, all documented in the IP user guide.