If you have invited yourself or a colleague to Kassatellen.nl and have not received the activation email, the first step would be to check if it has not ended up in the spam folder.
If that is not the case, please contact us via support@thenextsoftware.io We will ensure that the account is still activated.
Note: Inactive accounts do not work, and you will not be able to change passwords for them. So it is always important to activate your account before you start using it.