Cloning of submodule src/chump fails

[a-1219]

I get the following error on CachyOS/Arch Linux while after successfully cloning submodules src/chuck and src/chugins:

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

It fails to clone git@github.com:ccrma/chump.git and aborts.

[The-Pezman]

I got the same issue. Looks like the key is outdated.