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Per https://community.platformio.org/t/zephyr-rtos-integration-with-the-thunderboard-sense-2/23209.
The
tb_sense_12.json
board currently only supports mbed-oshttps://github.com/platformio/platform-siliconlabsefm32/blob/5ea9785453007cd0c813adc219c421d9ad927343/boards/tb_sense_12.json#L17-L19
but per https://github.com/zephyrproject-rtos/zephyr/blob/zephyr-v2.6.0/boards/arm/efr32mg_sltb004a/doc/index.rst Zephyr 2.6.0 (which is the current Zephyr version used by this platform) supports that board too. Support for building with Zephyr should be enabled in the board manifest.