Question-and-Answer Resource for the Building Energy Modeling Community
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This is just the wrong EMS calling point, You're using callback_end_zone_timestep_after_zone_reporting.
Please refer to the EMS application guide: https://bigladdersoftware.com/epx/docs/23-2/ems-application-guide/index.html
I'd start with AfterPredictorAfterHVACManagers or something like that. Tweak the calling point until you see it working. Maybe you'll need to put it at InsideHVACSystemIterationLoop, but that's going to slow down the execution time.
