code: async function setPreferredMcpTimezone(accessToken, timezone) {
      let tz = getValidTimezoneOrThrow(timezone);
  
      return mcpCustomizr.putSettings(accessToken, {
          timezone: tz,
      });
  }
docs: Update the preferred timezone from Customizr
  @param {string} accessToken - Access token to use to call Customizr
  @param {string} timezone - IANA timezone (eg. Europe/Amsterdam)
  @return {Promise<void>}