Hi Hat not sounding

I’m using Dorico 3.5. I’ve written several things for hi hat. When I click on the hi hat instrument, both in write and play mode I hear it, but when I press play, it doesn’t sound. Could anyone shed some light on this?
Thank you in advance.

Do you have a screen shot, or a small example to share?

I would have to see more to be able to help.

Robby