Sometimes you need to assign a task to people who do not work in your Bitrix24. You can add them by the email address.
How to do it?
When creating a task, select the Invite a guest option in the Responsible person field.
Enter an e-mail, First Name, Last Name and click Invite.
After that the user will be added to the task.
When the task is created, a message with the link to the task will be sent to the invited person.
To add a comment, you can reply to this email or go to a separate page with the task.