Can't activate FaceTime after installing Mountain Lion

After installing Mountain Lion, I opened Facetime and attempted to activate it using my Apple ID, this was what I got:
"The server encountered an error processing registration. Please try again later."
I created a new Apple ID and tried again; same thing. I contacted Apple Support for help. After hours of instructions, reboots of my MacBook, reinstalling Mountain Lion, and a lot of patience later., the outcome was the same. It just couldn't be activated.
Today, I tried to activate Game Center, know what? Similar problem. This was the error message I've got:
"The requested operation couldn't be completed due to an error communicating with the server."
Any idea?

Facetime for Mac community

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