Hi,
I had this problem with my iPad Air. I did a research and everyone says to cheach the connection and to be sure that the ID is working and all the emails are verified. I followed all the steps and nothing worked for me. My Wifi Works as a charms. Loging to the Apple using my ID working fine and all the emails "VERIFIED".
Her is my expereiance and the solution:
Nothing to do with your ID or the Internet connection or the WiFi setting. The problem is on Apple Server OR on the device it self.
What I did to solve this problem is going to the General --> Reset All the Settings. Be sure not to delete your data. Just reset all the settings. Then turn on your device and try again to sign in.
For me, I was able to sign in and verify to Facetime with my ID and the same WiFi connection that everyone was saying to check them. For the iMessage, I was able to sign in but not to verifying... it start to give me "iMessage Server Error ... Try again" on this phase. I tried to verifying more than 3 times, same error. Then I just turned my iPad Air off and turn it on again. I went to the iMessage to try again. I suprized to see the the iMessage was successfully setup!! and everything working great.
Note: iPad Air crashing a lot. One example: I want to setup my email: Setting --> Mail, Contact, Calendar --> Add new mail account ------> I gave the parameters then ---> Next CRASHED HERE. Tried again, it worked fine. Another day setup another email account ---> CRASHED in again during the setup in different place. Change the Background ---> some times Crashing. Brwosing the web ---> Crashing ........
However, new product means problems at the begining. I just want to say: Don't guys always pushing the problems to be the client resposibilities. Apple is not perfect, No one is perfect, We need help from you guys when we need it. The above problem is caused by Apple Server NOT by the user!
Thanks,