arjen05 Not 100% sure what the issue but the 1st thing I would check is to open the file you save in Step 8, scroll down a bit and confirm that the file has some non-reward stay activitiy in it. If it does not (and I suspect it doesn't), go back to Step 3, and before you select the specific time frame you are requesting, make sure activity filter (just to the left of the time filter) is set to "All Types". Then repeat the other steps.

If that is not the issue, you can always try just opening a new chat, pasting the prompt and uploading your file again(asuming you have confirmed it does have ALL your stay data) and running it again. Since ChatGPT is probabilistic and not deterministic, it often (and quite maddingly) provides different responses to the same question for no apparent reason.