You might need to adjust .cargo/config.toml, Cargo.toml and possibly update pin numbers or peripherals to match the specific MCU or board you are using.

Update .cargo/config.toml with the correct probe-rs command to use your specific MCU. For example for L073RZ it should be probe-rs run --chip STM32L073RZTx. (use probe-rs chip list to find your chip)
Update Cargo.toml to have the correct embassy-stm32 feature. For example for L073RZ it should be stm32l073rz. Look in the Cargo.toml file of the embassy-stm32 project to find the correct feature flag for your chip.
If your board has a special clock or power configuration, make sure that it is set up appropriately.
If your board has different pin mapping, update any pin numbers or peripherals in the given example code to match your schematic

If you are unsure, please drop by the Embassy Matrix chat for support, and let us know:

Which example you are trying to run
Which chip and board you are using

Embassy Chat: https://matrix.to/#/#embassy-rs:matrix.org