Help with parked regen?

I have got an SCR fault showing up on my dash. I called roadside assistance and they told me to do a parked regen tonight, and call them back in the morning. Well after going to YouTube to figure it out, I'm still having trouble with the regen. I do indeed have the button that says disable on top and manual on the bottom but holding that down for several seconds doesn't do anything.

Instead what I've done is set my cruise control on and bumped it up to 1200 RPMs. If I simply leave the truck running for an hour at 1200 RPMs Will that count as a parked region? I have no indicator showing up saying that I'm doing a regen.

I drive a 2022 kw