Cant create a site with å,ä or ö (swedish chars) in url

When I try to create a site with url:lidingö i get the following message:

UnicodeEncodeError: ‘ascii’ codec can’t encode character u’\xf6’ in position 6: ordinal not in range(128)"}

Does someone know how to resolve this?

Try adding double quotes, so
url: "lidingö"

Did not work. This is the content of my wordpress_sites.yml:

      - "lidingö"
    local_path: ../lidingonaprapaterna # path targeting local Bedrock site directory (relative to Ansible root)
    theme: lidingonapprapaterna
    branch: master
    # repo_subtree_path: site # relative path to your Bedrock/WP directory in your repo (above) if it is not the root (like the roots-example-project structure)
      enabled: false
      subdomains: false
      enabled: false
      enabled: false
      duration: 30s
      disable_wp_cron: true
      wp_home: "http://lidingö"
      wp_siteurl: "http://lidingö"
      wp_env: production
      db_name: lidingonap_prod
      db_user: lidingonap_dbuser
      # Define the following variables in group_vars/production/vault.yml
      # db_password:
      # auth_key:
      # secure_auth_key:
      # logged_in_key:
      # nonce_key:
      # auth_salt:
      # secure_auth_salt:
      # logged_in_salt:
      # nonce_salt:

This is an issue with Trellis being tracked here: