Hi there! I understand you're having trouble synchronizing your activity with the Decathlon Connect app. I'm here to help you out! Let's figure this out together.

Can you please provide me with a bit more detail? For instance:
- Are you receiving any error messages when trying to sync?
- Have you verified that your connection (Bluetooth or Wi-Fi) is stable?
- Is this happening with specific activities, or is it a general issue?

Once I have a better understanding, I can guide you through some steps to resolve it.

It says" Synchronisation failed" and says to try again later. Have tried several times over last few hours. All connections are in order. General issue, never happened before

Thank you for the details! Since you’re consistently seeing the "Synchronization failed" message and it’s a general issue rather than activity-specific, let's try a few steps that might help resolve this.

1. Restart the App: Close the Decathlon Connect app completely and then reopen it. This can sometimes clear temporary glitches.

2. Check for App Updates: Ensure that you have the latest version of the Decathlon Connect app. Open the Microsoft Store on your Windows device, search for the app, and check if there's an update available.

3. Log Out and Log Back In: Sometimes logging out of your account and then logging back in can refresh the synchronization process.

4. Clear App Cache: If you're using the app on a mobile device and not on Windows, go to your device settings, find the app, and clear its cache. For Windows, this may not be applicable.

5. Check Server Status: Occasionally, there could be issues with the servers that handle synchronization. It would be worthwhile to wait a bit and try again later, as the app suggested.

6. Reinstall the App: If the issue persists, consider uninstalling and reinstalling the Decathlon Connect app. This can often resolve deeper issues.

If none of these steps help, it might be best to contact support for further assistance. You can reach them via email at [email protected].

Let me know how these steps work out for you! Are you satisfied with the solution I provided?