OPTEE RPMB Secure storage on high secure device

Good morning, Please I am trying to use OPTEE RPMB secure storage on an High secure board. The only resource I found is this one : https://optee.readthedocs.io/en/latest/architecture/secure_storage...
Missing Device (R003: Security Key not found)

I get this message on the MCB2140 eval kit when trying to use ULINK JTAG. Flash programming works fine. Any ideas.
Missing Device (R003: Security Key not found)

I get this message on the MCB2140 eval kit when trying to use ULINK JTAG. Flash programming works fine. Any ideas.
MISSING DEVICE (R003: SECURITY KEY NOT FOUND) Running in Eval Mode???

By the way, what message "MISSING DEVICE (R003: SECURITY KEY NOT FOUND) Running in Eval Mode" means? I'm using Keil with GCC, because Keil compiler has a limit for code size. When I upload program into...
MISSING DEVICE (R003: SECURITY KEY NOT FOUND) Running in Eval Mode???

By the way, what message "MISSING DEVICE (R003: SECURITY KEY NOT FOUND) Running in Eval Mode" means? I'm using Keil with GCC, because Keil compiler has a limit for code size. When I upload program into...