Can't delete mail with delete key?

I saw a post way back in 2015 about this same issue but nothing currently. No matter if I use my build in laptop keyboard or an external bluetooth keyboard, I simply cannot delete a message. I didn’t have this problem on my Mac… just Windows 11.

Is anyone else having this issue? If you did and have fixed it, what method(s) did you use?

Certainly other people are experiencing this. ANYONE?