Short answer: Refresh the profile, test another route, check whether the app is routed through VPN, then compare browser and app behavior on the same network.
Do not treat one broken app as total VPN failure
If other websites open, the tunnel works at least partially. Focus on the failing service and its route instead of reinstalling everything.
Refresh rules and subscription
Modern clients often rely on rule lists. Old rules can send a blocked service directly or send a local service through the wrong route.
Compare app and browser behavior
If YouTube fails in the app but opens in browser, the app cache, QUIC behavior, DNS or platform-specific endpoints may be involved.
Try another route from the current profile
Some services are sensitive to IP reputation and route quality. Test another active direction before changing client-level settings.
Keep banking and local apps separate
Do not solve a YouTube problem by forcing every app through VPN. Local apps may break when they should have stayed direct.
What to send support if it still fails
Send the device model, operating system, client app name, network type, route name, time of the test and a screenshot of the exact error. Do not post private subscription links in public chats.
Single-service failure flow
If Telegram, YouTube or Discord fails while other websites work, the tunnel is not fully dead. Check whether the failing service is routed through VPN, refresh rules, then test another route. For YouTube, also compare the app and browser: different endpoints, cache and QUIC behavior can make one fail while the other works.
What to record
Service: Telegram / YouTube / Discord
App or browser: ...
Network: Wi‑Fi / mobile data
Route: ...
Other websites open: yes / no
Visible IP changes: yes / no
Result after Refresh: ...That short record is better than “VPN does not work” because it points support to rules, DNS, route quality or app-specific behavior.
Do not over-fix one app
One broken app does not justify routing every local service through VPN or deleting the client. Keep the working parts unchanged. Update rules, try another route, compare browser and app behavior, then send support the short record. That preserves evidence and avoids creating a second problem.
Test one blocked service at a time
The fix is real when the same route opens the target service twice: once after a client refresh and once after switching networks. If only Telegram, YouTube or Discord fails, keep the rest of the setup unchanged and report that specific service.
Fix the blocked service, not the whole device
Open Foli, refresh the subscription and test Telegram, YouTube or Discord with one route at a time.