Little update. I made typo in command for debian keyring server. Instead of keyring.debian.org typed debian.keyring.org which, obviously, did not work.
So tried again:
sudo apt-key adv --keyserver keyring.debian.org --recv-keys BD11A6AA914BDF7E
Executing: /tmp/apt-key-gpghome.dBVBqDHUWm/gpg.1.sh...