If this doesn't work, try reinstalling all the noto fonts packages. I've had this issue once before and reinstalling fixed it.
If neither works, try reading through the comments of this package: https://aur.archlinux.org/packages/noto-color-emoji-fontconfig
what's the app? looks like it could be discord? running in flatpak? do you find the emoji font with fc-list | grep emoji? do other apps show emoji?
I have the same! Noto color emoji installed and all but they are black/white and many are missing.
Didnt find a way. There is no emoji package available. Nobody seems to care, I have no idea.
Font packages are a mess, otherwise I would just mix an emoji package with like Noto sans or so
