Problem of activation iMessage and FaceTime

Hi, after new MacOS update on MacBook Air I cannot activate iMessage or FaceTime, though I have already tried:

-restarting Mac or NVRAM

-checked my login and password

-disabled/enabled iMessage on iPhone

-checked Date&Time settings and etc.

 

The problem is following: "An error occuried during activation. Try again". That bug is quite annoying as I use mostly messages on the Mac and I would appreciate some help.

 

Thanks in advance


MacBook Air, macOS High Sierra (10.13.3)
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You are welcome. Good luck.

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