May I ask what modifications did you do?
It's propbably working best, if you do this on a fresh setup. Expecially Xposed shouldn't be installed at this point because netflix will not work if xposed was or is installed before you install netflix. Open Magisk, use MagiskHide and hide from root the following apps:
- com.android.cts.ctsshim
- com.android.cts.priv.ctsshim
- com.android.vending
- com.google.android.gms
- com.google.android.gsf
Then open the build.prop and
just edit everything what is inside the red boxes. After a reboot, your phone should be recognized everywhere as Google Pixel 4 XL (and by everywhere, i mean it), now you should be able to install netflix and magisk still should flag your phone green everywhere and inside the netflix app in the settings, it also should recognize your phone as Pixel 4xl and should give you L1
[Edit]
i dunno why in the picture in some places there is "PIXEL 4L", just write
PIXEL 4 XL there.