Hi there! I see you're encountering a 403 error with the Bryton Active app, with the message "not allowed (code: 403)." I'd like to help you get this sorted.

Just to clarify before we dive in: Can you tell me when exactly this error appears? For example, is it when you try to log in, sync your device, or perform another action within the app? Also, have you recently changed your password or account details?

Meanwhile, here’s a step-by-step approach to troubleshoot this issue:

1. Check Your Login Credentials: A 403 error often means that the server is denying access. Sometimes this happens because the app isn’t accepting your credentials. Even if you can log into the website fine, the app might still reject it. Please double-check that you're entering the correct username and password in the app.

2. Logout and Re-login: If you are logged in, try logging out of the app completely and then log back in. This can refresh your session and clear any temporary authorization issues.

3. Update the App: Make sure your Bryton Active app is updated to the latest version available for Windows or your device. Outdated versions may have compatibility or authentication issues.

4. Check Network and Firewall Settings: Sometimes your internet connection or firewall settings may block the app from connecting properly. Try switching networks (e.g., from Wi-Fi to mobile data) or temporarily disabling firewalls and VPNs to see if that helps.

5. Clear App Cache and Data: If possible on your device, clear the application cache and data, which can help resolve corrupted files that might be causing the 403 error.

6. Reset Password: Even if you can log into the website, consider resetting your password once then trying again on the app. Sometimes tokens or saved credentials get out of sync.

If you've already tried these steps, please let me know which ones so I can guide you further, maybe into checking app permissions or account status.

Looking forward to your reply! Are you satisfied with this initial guidance?