Ok, last test for test user, all works

roles/shell/tasks/users.yml

@@ -96,4 +96,3 @@
 - include: users/southerntofu.yml
 - include: users/dariusz.yml
 - include: users/aniruddh.yml
-- include: users/testuser.yml

roles/shell/tasks/users/testuser.yml

@@ -1,15 +0,0 @@
----
-- name: Setting up testuser
-  user:
-    name: testuser
-    groups: tilde
-    state: present
-    skeleton: /etc/skel
-    shell: /bin/bash
-    system: no
-    createhome: yes
-    home: /home/testuser
-- authorized_key:
-    user: testuser
-    state: present
-    key: "ssh-rsa testkey"