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AM6422: OTP KeyWriter: always get failure with TISCI_MSG_READ_SWREV message

Part Number: AM6422

Problem Description:
When sending the below messages, the TISCI_MSG_FLAG_ACK in the respParam.flags is always not set whether the VPP is pulling up to 1.8v or not. Are these messages available? Or need any prerequisite?
TISCI_MSG_READ_SWREV
TISCI_MSG_WRITE_SWREV
TISCI_MSG_READ_KEYCNT_KEYREV
TISCI_MSG_READ_OTP_MMR

And get the below log in the M3 console when send messages in the below sequences:
TISCI_MSG_READ_SWREV
TISCI_MSG_READ_KEYCNT_KEYREV
TISCI_MSG_READ_OTP_MMR

0xC19033
0xC10023
0xC29034
0xC20024
0xC19022