builtin.git fails to clone private repo

[Don Bower]

Here is my task: 

 - name: Install Private Git Repos
git:
repo: "{{ item.repo }}"
dest: "/home/don/Developer/{{ item.dest }}"
with_items:
- repo: g...@github.com:DonBower/ansible.git
dest: ansible

I can do this manually from the target hosts command line, but running ansible-playbook results in:

failed: [ideapad-ubuntu.ag6hq.net] (item={'repo': 'g...@github.com:DonBower/ansible.git', 'dest': 'ansible'}) => {

"ansible_loop_var": "item",

"changed": false,

"cmd": [

"/usr/bin/git",

"fetch",

"--tags",

"origin"

],

"invocation": {

"module_args": {

"accept_hostkey": false,

"accept_newhostkey": false,

"archive": null,

"archive_prefix": null,

"bare": false,

"clone": true,

"depth": null,

"dest": "/home/don/Developer/ansible",

"executable": null,

"force": false,

"gpg_whitelist": [],

"key_file": null,

"recursive": true,

"reference": null,

"refspec": null,

"remote": "origin",

"repo": "g...@github.com:DonBower/ansible.git",

"separate_git_dir": null,

"single_branch": false,

"ssh_opts": null,

"track_submodules": false,

"umask": null,

"update": true,

"verify_commit": false,

"version": "HEAD"

}

},

"item": {

"dest": "ansible",

"repo": "g...@github.com:DonBower/ansible.git"

},

"msg": "Failed to download remote objects and refs: Host key verification failed.\r\nfatal: Could not read from remote repository.\n\nPlease make sure you have the correct access rights\nand the repository exists.\n"

}

What am I doing wrong?

[Todd Lewis]

You have both

   "accept_hostkey": false,

   "accept_newhostkey": false

Does it run as you, or do you "--become"? Because there appears to be no key for github.com in that user's ~/.ssh/known_hosts file.