Xfinity stream app stopped working when I reinstalled it

My Xfinity stream app connected to a Fire TV stick, kept giving me a message that the update failed and had an exit option. When I tried to fix it by installing the app and reinstalling it the app became completely nonfunctional. The Xfinity stream app works on other Fire TV sticks on the same TV. Neither Amazon nor Xfinity support could help me fix this problem.  can you?