External Compass HMC5883L GY-273

i’m trying to connect the HMC5883L GY-273 compass to the apm 2.8 but when i connect the compass doesnt work in MP, anyone know if this compass works with the apm or is compatible?

As can easily be seen on ardupilot compass device drivers directory that compass is fully supported. All you need to do is to update your hardware to one of the over 60 supported autopilot boards
Do not use outdated hardware. It is more expensive in the long run.