I am flying LAX-NRT-DXB, its NH from LAX-NRT, 4.5 hour layover(ish) and then Emirates NRT to DXB

UA 1k rep told me that “i absolutely need a PCR test going to NRT” even though I have an onward ticket for same day. She mentioned that its a separate reservation, so thats why I need a PCR test.

Goes 100% against Japan rules and stated policies around transiting NRT.

Can anyone verify for me that she is mis-informed? and that ANA wont deny me boarding at LAX? (Bought ANA F ticket via
United)