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Hi Ahmet,

I suggest reaching out to our Customer Care team using the regional phone numbers under "For Critical Cases".

This way, you can connect with our team immediately to get assistance with this issue. Our Customer Care team typically handles authentication and licensing issues, so they would be the best ones to connect with regarding this issue.

I don't see anything showing as offline currently from Microsoft's Service Health page. This may be something specific to your account. Do you know if you're using Federated authentication to log in, in any way? 

The back-end for our authentication page does rely on Microsoft, so this may be why you're seeing the error.

I had this problem with a firefox browser update the other day; have you tried a different browser?

Yes of course I tried different browsers and also different computers, Internet  (different IP address)

Unfortunately, result is failed.
anyway thanks for the suggestion.

Sorry it didn't help.  It seemed to yesterday, but maybe there was another issue going on and it just seemed like a browser issue.