Midi device has no output

I'm using muse score 4 and a Yamaha PSR 670 work station. Evrything works fine with midi accept the output sound. In all my other programs like Cakewalk i have no issues with my workstation. And even in muse score the input and key assignments works fine. But there's no output to the device. What must i do? I've done these things below already.
1 Made sure the device was connected correctly.
2 Made sure the device was recognized by muse score.
3 Assigned key mappings as a test to my device.
4 Made sure midi remote control was enabled.

Now i don't know what to do anymore. Help please?