Usuarios invitados iniciaron sesión antes de activar la cuenta

[Stephen]

If they’re clicking an invite link in an email already sent to the mailbox they’ve effectively already verified the address.

I recall some discussion recently that the second email sent to activate the account may be unnecessary.

Edit: confirmed

Allow disabling activation email for invited users

It still is on our roadmap, adding it to the 2.2 list, it got delayed