I can probably find the email (I've been searching) if nothing else works but I definitely remember the email saying that clearing the cache was necessary. I can't remember if it was for web or on the phone (may as well try both, instructions on how to do so are on the web).
I use dexcom g6 with android 13. When I start the app on my phone it gives a warning about android 14 compatibility so I've been putting off upgrading the android version. Web searches say that the app is now ok with android 14 but the warning that shows up makes me wary so I'm sticking with 13 for now. I don't use my phone for much except the g6 anyway

Good luck!