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Mirror needs to know who you are before it shows you anybody’s work — every read is answered for one organisation, and which one is decided by who is asking.
Seats are given, not taken. Somebody with a seat invites your address, and the invitation is the way in.
The link beside the password field asks for your organisation and address and mails a link to set a new one, if it finds a credential to reset. It answers the same either way, so it never says whether an address holds an account.