Doing some research I have not found a known issue on this behavior. I have a few additional questions about the behavior that might help us find a solution.
Does the image fail to load if try to pull it using the JS API and display it in a local web page on your desktop? Or some other location other than on mobile? Also, are there any error messages and other behaviors that have started around the upgrade? Did any permissions change after the upgrade?
The image will load in a local web page using the JS API. No permissions changed after the upgrade. In our logs we can see a POST request that successfully retrieves a trusted ticket. Then we make a request for a viz. Tableau Server responds with a 302 (reroute). Then we are routed to vizportal/api/web/v1/auth/signin and that responds with a 401 error. We have not seen any other errors with this upgrade.