Wouldn’t delete request when you press on the cross. Can only accept…
Can you do it by logging into the Blizzard client on a computer? Unfortunately I can’t find a way to do it through a browser.
I only have HS on mobile.
In that case I’d try reinstalling but if that doesn’t work then I’m out of ideas.
I already did twice. I was fine before till some patch broke it.
The best option is to find a friend with a PC, install the Battle.net Launcher, log in, then remove friends there. (You don’t need to install Hearthstone, just the Battle.net Launcher.)