that was your mistake.
please read carefully dr.ketans guide on using method 01:
https://forum.xda-developers.com/galaxy-note-9/how-to/root-note-9-n960f-fd-experimental-t3832143
do NOT skip any of the steps.
when flashing his root oem fix, in aroma setup choose patch oem fix and magisk root.( say yes to all)
i have the same phone as you and it works if you follow everything.
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