We want to use SSO for our users (internal employees) but give specific board access based on team. When we use the "specific people" option, it sends them an invite (even though they already have an account via SSO) but doesn't let them sign up (again since they already have an account via SSO) https://webpagefx.mangoapps.com/msc/NjgzNTk0Xzg5MDc2MTk
Maybe this is a bug?