Just tried to signup for tana - but their waitlist form (interestingly) didn't ask me for an email to contact me with followup steps and I can't seem to create an account :(. How did ya get access?
Someone is looking into it now.
You can go through the back-door currently here: https://app.tana.inc/create-account (currently requires credit card to get in directly, but you can cancel it directly after).