Registering returns to a dictionary attribute

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So, I have a dictionary variable containing information about all of my users, like this:
user_dictionary:
bjones:
realname: Bob Jones
uniqueid: 1007
status: active
notes: Database consultant

Part of my playbook changes users’ UIDs to make sure they’re consistent across all of our systems. After that happens I want to make sure that the correct user owns things like their mail spool. However, not every user HAS a mail spool, and I’d like that to be handled gracefully without spitting out any red failure text on playbook run - just skip the task if no mail spool exists. So, I was thinking I could do something like this:

tasks:

  • name: Check if mail spools exist
    stat:
    path: “{{ ‘/var/spool/mail/’ ~ item.key }}”
    register: user_dictionary[item.key][“mailspool”]
    with_dict: user_dictionary
  • name: Set ownership and permissions of user mail spools
    file:
    path: “{{ ‘/var/spool/mail/’ ~ item.key }}”
    owner: “{{ item.key | lower }}”
    group: “mail”
    mode: “0660”
    state: file
    with_dict: user_dictionary
    when: item.key in getent_passwd and item.key.mailspool.stat.exists

But, that register statement isn’t working. There are no mailspool attributes in user_dictionary after running the first task. Anyone know how to register to a dictionary attribute like that?