Within Teamwork Chat, you may find that you are unable to chat to other users when you initially log in as an external user.

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As an external company user you cannot write to anyone initially. It is only when a user in the owner company writes to you directly that you can reply.

Once someone in the owner company adds you to a conversation or channel, you can send messages in that conversation forever as long as you are a member.

Note: As an external user, you cannot see other members of your own company in the people tab within the sidebar. Once someone in the owner company adds them to a conversation, they can then send messages in that conversation.