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Could you confirm the HIB_LPO_SEL is tied to ground and you are not seeing the external 32.768 kHz clk on the crystal pads? The 60us delay is required for the PMU to function properly. Based on your selected RC value in the schematic, it seems that you should be getting that delay but please confirm the LPO_SEL is tied to GND and we can further try to debug this issue.