No, iframes are not supported.
You either want to manage user accounts on your parent site, then authenticate with Discourse Connect, or simply have a link to your Discourse.
You could link to the login route to prompt them immediately? /login
No, iframes are not supported.
You either want to manage user accounts on your parent site, then authenticate with Discourse Connect, or simply have a link to your Discourse.
You could link to the login route to prompt them immediately? /login