Hi there! I understand you're able to reply to messages on Coligo LMS from your PC but not from your phone. Let's see if we can figure this out together.

To help me better assist you, could you tell me:
- Are you using the Coligo LMS app on your Android phone or accessing it via a browser?
- When you try to reply to a message on your phone, do you see any error messages or is the reply option simply not responding?
- Have you recently updated the Coligo app or your phone's operating system (Android 10)?
- Has replying worked on your phone before, or is this the first time you're experiencing this issue?

Once I have a bit more info, I can guide you with some steps. But meanwhile, here are some initial checks to try on your Android device:

1. Check App Permissions:
Sometimes the app needs permissions like storage or network access to function fully. Go to your phone’s Settings > Apps > Coligo LMS app > Permissions and make sure relevant permissions are granted.

2. Clear App Cache:
Cached data can occasionally cause glitches. Go to Settings > Apps > Coligo LMS > Storage > Clear Cache. Then restart the app and try again.

3. Internet Connection:
Confirm your phone’s internet connection is stable—try switching between Wi-Fi and mobile data to see if that helps.

4. App Update:
Ensure you have the latest version of the Coligo app installed from the Google Play Store. An outdated app might have bugs that were fixed in newer releases.

5. Re-login:
Logging out and back into the app can sometimes resolve session-related issues.

If none of these resolve it, we can look into advanced settings or possible server-side issues. Let me know how these first steps go!