Hi there! I see you're getting the error message “Citi Mobile App detected issues on your mobile and cannot be opened at this time” on your Mac with OS X 10.15. That sounds disruptive. To help you better, may I clarify—are you using the Citi Mobile app through an emulator on your Mac, or are you accessing Citi via a web browser? Also, have you tried any fixes yet like restarting the app or your device?

Meanwhile, here's a general plan to resolve this kind of problem, mostly on mobile devices but often applicable when apps emulate or interact with OS features:

1. Check for App Updates
Make sure your Citi Mobile app is the latest version. Sometimes older versions have compatibility issues that cause these errors.

2. Restart Your Device
A simple restart can clear temporary glitches.

3. Reinstall the App
Delete the app completely and reinstall it from the official source. This can clear corrupted files that trigger error messages.

4. Check Security & Permissions
Sometimes the app restricts access if it detects risky or non-standard permission settings on your device or other apps. On Mac, verify any security settings or apps that might interfere with Citi's app functioning.

5. Ensure OS Compatibility
Your OS X 10.15 (Catalina) should generally be compatible, but ensure any system updates are installed. Older OS versions sometimes have underlying issues with newer app security protocols.

6. Network Connection
Verify you have a stable and secure internet connection.

If you're using a web browser on your Mac to access Citi and seeing this message, you might want to try clearing your browser cache and cookies, or try a different browser.

If you have tried reinstalling or restarting already, let me know so we can dive deeper into advanced settings or account checks. Does any of this match what you've tried, and which method are you using to access Citi?

Also, for more specific guidance, there are reports that uninstalling and reinstalling the app resolves this error for many users1.

Let me know where you stand, and I’ll help you from there!

Its on an android

Thanks for clarifying that you're experiencing this issue on an Android device. The error message that Citi’s app detected issues on your mobile and won’t open is not uncommon, and there are some targeted steps we can take to try to fix this.

Here’s what I suggest you try, step-by-step:

1. Clear App Cache and Data
- Go to your Android device’s Settings > Apps & notifications > See all apps > Citi Mobile.
- Tap Storage & cache.
- First tap Clear cache, then, if the issue persists, tap Clear storage/data. This removes temporary files that could be corrupted.

2. Update the Citi Mobile App
- Visit the Google Play Store, search for the Citi Mobile app, and make sure it's updated to the latest version. Developers often release updates to fix bugs and improve compatibility.

3. Restart Your Device
- After clearing the cache/data and updating, restart your device to refresh the system.

4. Check for Android System Updates
- Sometimes OS updates fix underlying security or compatibility issues. Go to Settings > System > System updates and make sure your Android version is current.

5. Reinstall the App
- If none of the above work, uninstall the Citi app completely, then reinstall it from Google Play. This ensures any corrupted app files get replaced fresh.

6. Check Network Connection
- Make sure you are on a stable Wi-Fi or cellular network. Sometimes network issues can cause the app to malfunction on startup.

7. Verify No Interfering Security Apps
- Some security or VPN apps on Android can interfere with banking apps detecting mobile security status. Temporarily disable or uninstall such apps and try again.

Given your message, some users with recent app updates reported similar issues and resolved them by clearing cache/data or reinstalling the app6 3.

If after these steps you still see this issue, it may be good to check if Citi is experiencing any outages or maintenance periods using a status tracker like Downdetector1.

Would you like me to guide you through any of these steps in detail? And have you already tried any of these fixes?