If your Assignments Home page feed does have any content on it, you can refresh the page by clicking again on the Home button or dragging down on the screen to refresh the mobile apps.
Above the upper right corner of the feed is a Funnel icon. Click this to choose from selection of filters, including Show All, Show Uncompleted and Show Completed. In the current mobile app releases, the default view shows all (both uncompleted and completed), but if you have an earlier version of the app, the default may be to show uncompleted.
If you still don’t have any assignments but think you should, then a Company Admin needs to check to see that your assignments are correct. Reach out to your Company Admin, or contact us here on the support site or at firstname.lastname@example.org.