Account activation
When the account was created via team invite or activation link (e.g. after signup), you may see account activation page. For invites: opening the email link you see invite info and Accept / Decline (and Sign up / Log in if you have no account).
Activation after invite
If the account needs completing registration (e.g. set password or name), you see Account activation form: fields e.g. First name, Last name, Password (and confirm). After save the account is active and you are added to the organization in the given role. Invalid or expired link: Invite invalid or expired - then contact the inviter.