@sbgd @aanduque @steffen and @sunny I had a similar issue, though with multi networks, but I imagine the same (or similar) fix could help you work around the inability to add a domain. See the steps in my post here - http://local.getflywheel.com/community/t/local-router-error-message-on-multi-network-instance/1913/12, and consider/try it. I imagine it would likely work for you as well.