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We request a 50-ks XMM-Newton observation of an X-ray-luminous tidal disruption event during Cycle 20 in order to track its long-term X-ray flux behaviour comma and to clarify lingering questions regarding its early flux evolution. The event comma which occurred in the galaxy SDSS J143359.16+400636.0 at z=0.099 comma first detected in February 2020 comma reached a peak luminosity of 10elev44 erg s 1 in the 0.3-10 keV X-ray band comma which was around 20 times more than the peak optical-UV luminosity. Optical comma UV comma and X-ray lightcurves showed a decline in flux from the source consistent with telev 5-3. The start time of the X-ray emission is unclear comma which has implications for the X-ray emission mechanism comma but an observation at long time scales with XMM with clarify this.