Dear Erich Styger,
I have executed the following steps:
1 I put the MCU LINK in boot mode by connecting a jumper to J3 connector.
2 I connected the MCU LINK to the PC via USB. The RED LED (LED1) was ON.
3 I successfully updated the MCU LINK to the latest version 3.122 using the program_JLINK.cmd command.
4 I disconnected the MCU LINK from the PC and removed the jumper on J3 connector.
5 I connected the MCU LINK to the target (based on LPC55 CPU) and then powered it on.
6 I connected the MCU LINK to the PC via USB.
7 I started the MCUXpresso IDE v11.7.1_9221.exe tool and selected my software project.
8 I entered debug mode and the following window was shown on the screen:

9) Then I selected the J-Link MCU-link device and pressed OK, but the following error message was displayed on the screen:

Did you have a similar problem? How did you fix it?
Thank you very much for your help and cooperation.
regards