Assignments are stored as edges. You can view all of the assignment edges for a user in two ways:
View them at api2.openreview.net
In your browser search bar, enter the following. If you want to view assignments for an Area Chair, change 'Reviewers' to 'Area_Chairs'. Replace your_venue_id with your full venue id. This will bring up all of the assignment edges for all of your venue's reviewers.
2. Now we want to filter by a particular reviewer. If you look at a specific edge, you will see that the field "tail" corresponds to the profile ID of the assigned reviewer. So to see only the assignments for reviewer ~User_One1, change your search query to the following:
Set a variable 'tail' to the profile ID of the user you are interested in, for example:
3. Set a variable 'invitation' to the invitation of the edges you are trying to view. If your user of interest is a reviewer, the invitation would be in the format <your_venue_id>/Reviewers/-/Assignment.