I can`t connect to battlenet desktop app, just offline

I can’t connect to battlenet. Last week I had no problem. And now I can only connect offline. Is it a problem with my account? Or with Blizzard? I installed and uninstalled the application and games, I thought it might be an error from a game. Now I don’t have any games installed and it’s the same problem after I put in my email and password. What would be the solution?

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