Same for us too, waiting for review for more than 2 weeks. Expedite app review didn't work, wrote a detailed email regarding submission timeline, no response.

I too faced this issue today. Just got a temporary way to install the app successfully. The following steps worked for me: Delete the old app from your iPhone. Open TestFlight app on your iPhone/testing device and install the last successful build of your app from TestFlight which didn't cause this integrity issue. Once old version of your app is successfully installed, then come to latest build of your app on TestFlight app and tap the 'Update' button. Once successfully updated, now you will be able to open and run your app without any issue.