First, check your spam or junk folder - the odd email lands there while our sending domain is new. Then go back to the Check your inbox screen (it remembers your address, even after a refresh) and tap Resend email. The button rests for a minute between sends so the mail provider does not throttle you.
If you try to log in before tapping the link, the login page says so and offers the same resend. If the link in the email has expired or was already used, you land on an honest "That link did not work" screen with a resend button - and if you open it in a browser where we do not know your address, it asks for the email first.
If you signed up and were taken straight into the app, your account is already active and there is nothing to confirm. Still stuck? Email hello@taskparty.co and we will sort it.