+ AA6YQ comments below
This also happened in June. Uploading LOTW causes a duplicate QSO, I think because one QSO somewhere in my 74,549 QSOs has no data or Callsign and DXKeeper adds the next QSO and creates a dupe. I THINK!
+ That's not correct:
1. DXKeeper won't attempt to upload a QSO to LoTW if that QSO lacks a callsign.
2. TQSL won't accept a QSO for uploading to LoTW if that QSO has already been uploaded to LoTW.
FYI - all my QSOs are loaded in DXKeeper via N1MM Logger.
I've misplaced the complicated info you sent last time this happened.
+ Exactly what is it that isn't working as expected?