I believe the hotel on long layovers need to be on Qatar ticket stock. That’s my understanding but happy to be corrected
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The only time I went to a hotel was 2018 flying Madrid-DOH-PER. AsI'm sure that's correct, but again, at least in the past a few years ago, they were pretty specific with which QR flights/routes qualified (including when the layover was about the same as flights that did qualify) ; there was certainly one from OZ, connecting through DOH to Europe, where I was knocked back on, including after appeal. May be different now.