Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
In the debug configuration, under the "Debugger" tab, can you add -d3 to the OpenOCD command line and then check if there are any error messages in the OpenOCD console ?