I have assigned students to teams. Where/how do they see their team assignments in Canvas?
I believe you are referring to assigning your students to groups in Canvas and you want to know how students figure out the group in which they belong, correct?
If this is the case, there are two ways for students to see their groups, globally and withing each course. To see the global option they login to Canvas and click on the "Groups" menu in the global navigation bar on the left. What pops up is the list of all groups in all courses in which they are a member. This is not the most useful as it doesn't show the course name for each group. If they click on the link at the bottom of the list called "All Groups" they will get a list of all current and previous groups with the course listed on the right.
Within a course, students will see a list of their group memberships in the right column in a section called "Course Groups". Hope this is what you are looking for :-)
This guide might also be helpful? How do I view all groups in a course as a student?
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