URGENT: USMLE STEP 2 CK cancel

[StepRepeater1]

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Hi, Ive already bought my window, and extended it. My exam is in 1 day. I will not be able to make it. Already spoke to ECFMG about buying a new window, my window ends in 4 days. I would need to reapply after 4 weeks have past since the end of my window. In terms of the exam itself, do I need to cancel with prometric or just let it ride through?