Can someone explain y Naruto didn't/can't use the fox power
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"When Naruto arrives at Hōzukijo, Mui, the head of the prison, quickly places the Fire Release: Heavenly Prison on Naruto, sealing his chakra. Naruto learns this the hard way after using his shadow clones, Naruto quickly collapses from the pain caused by the seal."
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"An imprisonment technique (禁錮術, kinkojutsu) used by Mui's clan. The ones who are subjected to this technique have a formula applied to them, which will
prevent them from moulding chakra and from using techniques. It will also drain them of their chakra at a slow but steady rate. Mui uses this technique on the prisoners of Hōzukijō."
Naruto using the Nine-Tails' chakra is the same as using his own chakra, as it mixes with his when he uses it