Problem on changing the halftone color

Hello,

I’m trying to give an illustrator image to halftone pattern from the tutorials on the web.

But after making the halftone effect, I can’t change my halftone color.
Halftones turn gray when I change the color.
Where do you think the problem is?

The software is adobe illustrator.

regards,

Saeed

Post the tutorial you used.
Any number of things could be wrong.

Thanks for your reply.
The problem was solved.