After the collaborator is added, they appear in the collaborator list.Shared agents may require a plan that includes sharing. If an invite says the owner needs to upgrade, the owner should open Settings -> Billing and choose a plan that includes Shared agents.
Choose Telegram or WhatsApp for the collaborator if you want to create a messaging link for them.If you want Aubrey in a shared Telegram or WhatsApp group instead, see Use Aubrey in a group chat.