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why does my windows phone always tells me that it has an activation error when i try to sign into my microsoft account?
Make sure the time and date on your phone is correct.
Go to Setting > date+time
If it is set on auto, turn it off. Put in the correct date and time. Then turn it back on auto. Restart phone. Once it retarts make sure the date and time is right. Then try to sign in with your Microsoft account