By default Windows doesn't let UWP apps such as the Microsoft Store, Mail or Weather use the local system proxy. In system proxy mode, their requests may be blocked by Windows before they reach 5UF, so they won't load or keep spinning. Turning on the virtual network adapter (TUN) as well doesn't remove this restriction.
Check and repair:
1. Open 5UF and go to Settings → Microsoft Store / UWP network check.
2. The app checks the system proxy, whether the selected app may use the local proxy, and whether Microsoft services are reachable.
3. Choose the affected app (the Microsoft Store by default).
4. If it says local proxy access isn't allowed yet, click Repair and click Yes in the Windows administrator prompt.
5. When it confirms that access is enabled and verified, fully close the app and open it again.
Repair only allows the selected app to reach local services; existing exemptions and routing rules are kept. If the Microsoft Store isn't listed, open the Store once and check again.
If some Microsoft services are still unreachable after repair, the problem isn't app permissions: check the server, DNS and routing rules, try switching to virtual adapter (TUN) mode in Settings and restarting the affected app, or use AI Diagnosis.
