Thank you, but routing
MAD-DOH-AKL (QR) + AKL-PPT (TN) works and prices correctly as a single Europe to South Pacific award
[As does
MAD-LHR (IB) + LHR-NRT (BA) + NRT-PPT (TN) or
MAD-DME (IB) + DME-NRT (JL) + NRT-PPT (TN) for example.]
but
MAD-NRT (IB) + NRT-PPT (TN) or
MAD-HKG-NRT (CX) + NRT-PPT (TN)
do not. I think I have spent >4hr on phone but no joy.