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Knowledge of the structure and kinematics of gas around supermassive black holes is vital to understanding accretion and thus AGN feedback. To this end comma we comma the AGN STORM 2 team comma have been awarded a Large 198-orbit Hubble Space Telescope program and a Las Cumbres Observatory Key Project to measure reverberation lags in Mrk 817. Previous UV-optical reverberation mapping campaigns have successfully mapped the outer accretion disc and broad line region comma but reveal that X-rays openParthought to be the primary driver of multi-wavelength variabilityclosePar do not correlate with longer wavelengths as well as expected. X-ray spectral and timing measurements are necessary to track changes in the geometry and dynamics of the inner accretion flow that likely affect our inference of the outer disc and outflow str