code: def iter_user_identities(user):
      
      from indico_vc_vidyo.plugin import VidyoPlugin
      providers = authenticators_re.split(VidyoPlugin.settings.get('authenticators'))
      done = set()
      for provider in providers:
          for _, identifier in user.iter_identifiers(check_providers=True, providers={provider}):
              if identifier in done:
                  continue
              done.add(identifier)
              yield identifier
docs: Iterates over all existing user identities that can be used with Vidyo