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Ansible: How to add multiple SSH keys to user 

---
- name: Configure admin SSH keys
  hosts: all
  become: yes

  tasks:
    - name: Ensure myuser user exists
      user:
        name: myuser
        shell: /bin/bash
        create_home: yes
        home: /home/myuser
        state: present

    - name: Ensure .ssh directory exists
      file:
        path: /home/myuser/.ssh
        state: directory
        owner: myuser
        group: myuser
        mode: '0700'

    - name: Add SSH keys to authorized_keys
      ansible.posix.authorized_key:
        user: myuser
        state: present
        key: "{{ lookup('file', 'admin_authorized_keys.pub') }}"
        exclusive: yes

and create admin_authorized_keys.pub with the public keys you want to add to the user’s authorized_keys file, e.g.

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIK32rucsbvMxsTWaSFenYXmKgFU7CaLYNwuDoXpGTig/ user@user-desktop
ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHDI/U4vZL3nkm/654cvdzwONKfR+wBeiJQYiJZ4mRD4 user@user-desktop