The community member is unable to add their domain name to their webstudio account because the hostname given by webstudio starts with "__". A community member in the comments states that this is a known issue, and that webstudio will be making a change to accommodate this, but in the meantime, the community member can point their domain nameservers to Cloudflare and manage the DNS there.
I sent a message to my domain name provider (ionos) bc i cant add my domain name, he told me that i cant because the host name given by webstudio start with __ any solution?
Known issue right now (they should allow that but dont for whatever reason). We are going to make a change to accommodate them but for now you can point your domain nameservers to cloudflare and manage dns there https://github.com/webstudio-is/webstudio/issues/3124
