copy modifier to selected isnt even an option. Ive sesrched for an entire day and held up by this.
it isnt that the option isnt active, the option is not even there. I've tried this way and many others. the option just isnt there.
Are you using an old Blender version? Download the latest one just in case.
I don't know when exactly it was added, but 2.93LTS already has the feature (Copy to Selected).
But you can also use (in the 3DViewport) CTRL+L > Copy Modifiers.