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If you've accessed this page on the same computer that runs TL – it might be an issue with your antivirus software or firewall: you should try to disable them (for a moment) and then restart the launcher. If the issue is gone by then, you'll know what is causing it.
It is highly unlikely that the launcher services are not available for everyone. You should check your Internet connection.
In any case, you might notify us about the issue in our Discord.