Pawnee Technologies is a global cloud software company that uses Slack Enterprise Grid to communicate and collaborate. You're a Slack Workspace Admin for your company's External workspace where your team collaborates with external partners. Today you're onboarding a new team member who will need to log in and join your workspace. You receive a direct message (DM) from them reporting a problem. While they had no issues joining the Global and Social workspaces, they report that Slack isn't giving them an option to join the External workspace, even though it shows up when they search for it.

Why is the new hire unable to join your workspace?

(Select the best answer.)