Posgresql_user not working properly

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I am trying to use community.postgresql.postgresql_user to create a user on a brand new database. This fails with an error that just says “MODULE FAILURE se stdout/stderr for the exact error”. When I output stdout/stderr, they say “VARIABLE IS NOT DEFINED!”. The task I am running is:

 - name: Config | Create dba user
    become: true
    become_user: postgres
    community.postgresql.postgresql_user:
      name: dba
      state: present
      password: "{{ db_password }}"
      role_attr_flags: CREATEDB,SUPERUSER,CREATEROLE
    register: createuser
    environment:
      PGOPTION: "-c password_encryption=scram-sha-256"

However, even when I remove the only line that has a variable in it, it fails with the same error. I am kind of at a loss with this one. If anyone has any ideas, I would greatly appreciate it.