authorized_key and openssh_keypair are not part ansible core.

[adigozalov]

authorized_key and openssh_keypair are not part of ansible-core.
And need to be installed separately

ansible-galaxy collection install  community.crypto
ansible-galaxy collection install  ansible.posix

If authorized_key is going to be executed via sudo, like in solution of 2nd exercise ,make sure that the collection is available for root.

sudo ansible-galaxy collection list ansible.posix

Otherwise will get below error.
"The module authorized_key was redirected to ansible.posix.authorized_key, which could not be loaded."
To fix just re-run collection installation through sudo

sudo ansible-galaxy collection install ansible.posix