Within Teamwork Spaces, you can grant or deny access to spaces when individual users submit an access request.
Once a user has requested access to a space, the space creator will receive a bell notification and an email referring to the access request.
When you receive an access request, click the View Access Request button in the email notification or click the bell notification in Teamwork Spaces.
You will be brought directly to the Permissions section of the space. Any pending access requests will be noted in the People subsection of the Permissions area.
You can keep the current access level requested by the user or change the setting in the dropdown.
To approve an access request, click the green checkmark to the right of the request.
You will also have the option to deny the request.
For more information, see: Adding Members to a Space