SPV1050 VSTORE Voltage Not Rising to VEOC; LDO2 Application ?

Hello,
I used the SPV1050 chip to connect the circuit to the STEVAL-ISV019V1 evaluation board, and measured VSTORE to be 3.9V, which did not reach VEOC and naturally did not have LDO2 output. I use the STORE pin to power my sensor node load. May I ask which part of the energy I am using at this time is from the battery?
Besides, how can I make VSTORE rise to VEOC? Why hasn't my VSTORE changed under prolonged exposure to light.
Can the final LDO2 output supply power to the load, or can it only serve as a reference voltage for certain devices.
Thank you for your reply.