Hi there! I can understand how frustrating it must be not to send messages even with the send button lit up. Let’s work through this together.

Could you tell me a bit more about the situation? For example, are you using a specific app to send messages, or is it happening across multiple applications? Also, did this issue start suddenly, or has it been occurring for a while? Any extra details would really help me assist you better!

I use WhatsApp and it has happened yesterday.

Thanks for the details! Let's go through some steps to help you resolve the issue with WhatsApp.

1. Check Your Internet Connection: Make sure your device has a stable internet connection. You could try switching between Wi-Fi and mobile data to see if that helps.

2. Restart WhatsApp: Close the app completely (swipe it away from your list of recent apps), then reopen it. Sometimes, apps can misbehave, and a simple restart can fix that.

3. Update WhatsApp: Ensure you're using the latest version of WhatsApp. You can check for updates in the Microsoft Store if you have the app installed there.

4. Restart Your Device: If the above steps don't work, turn off your computer and then turn it back on. This can help clear any temporary glitches.

5. Free Up Storage Space: Sometimes if the device is low on storage, it can cause issues with sending messages. Check to see if you have enough space available.

6. Check for App Permissions: Make sure WhatsApp has the necessary permissions to operate correctly. You can check this in the settings of your device.

If you're still having trouble after trying these steps, I can look up more advanced options. Just let me know! Are you satisfied with the solution I provided so far?