Hi there! I’m sorry to hear that you’re having trouble with the Dunkin' app on your device. It can be really frustrating when apps don't work as expected. Let's see if we can figure this out together!

To help me understand the issue better, could you let me know if you’ve recently updated your app or if there have been any updates to your Android version? Additionally, are you using any specific device model? Sometimes compatibility issues arise after certain updates, especially with older devices.

In the meantime, here are a few steps you can try:

1. Check Android Version: Since you're on Android OS 9, ensure that your device is up to date. You can check this by going to Settings > System > Advanced > System update.

2. Clear Cache and Data: Go to Settings > Apps > Dunkin’ > Storage, then tap on Clear Cache and Clear Data. Sometimes, this can resolve compatibility issues.

3. Reinstall the App: If you're still facing issues, you might want to uninstall the app and then reinstall it. To do this, go to Settings > Apps > Dunkin’, select Uninstall, and then download it again from the Google Play Store.

4. Check Device Compatibility: If none of these steps work, the app might no longer be compatible with your device. I've seen some users express similar issues, especially with older devices or previous app versions (Reddit Discussion).

Please let me know what you find, and we can proceed from there! Are you satisfied with the solution I provided?