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I can see that you posted a screenshot of the input mask on the field. I can also see that it is working properly. You put a mask like this @@ ###### @. You also put it as required.
So that error message appears when the field is not completed or empty.
Hope this helps. Thank you!
This is an old thread, if you need help please open a new thread next time so we can assist you better. I created a new thread for you and this is the URL: http://www.jotform.com/answers/573095
Thank you for understanding.