Hello @semo
Thank you for contacting the Canvas Community. We're sorry to hear you've been experiencing issues with limiting a TA to certain sections. When you add a user to a course manually, there is an option in the pop up box to limit the user only to the section they are being added to. If the TA is already here, click on their name in the people tab and go to their user page. Then click on "limit this user to only see fellow section users" If you wish a TA to have access to all sections simply do not check either of those. If you're still having issues, click the three dots on the right in people tab and "edit sections" add them to all of the sections in the course. All of these are good options.
