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Thanks for reporting this to us. As far as I know, the option to "Fill Mask Validation" was supposed to show an error that the Masked Input field should be filled out.
It should then behave like so:
I've escalated this to our Devs and although I won't be able to give you any timeframe, rest assured, we'll keep you apprised on this same thread if/when there's an update.
We're sorry for the inconveniences. Validation problem on phone number field is fixed now.
If you have any other questions please let us know.
Hello, I seem to be having this same issue on one of my forms - https://form.jotform.com/scorrado/serc-referring-provider-request
I believe I have it set up to accept no more or less than 10 digits but we keep having submissions come in with 9 digits on the fax number.
I have moved your question to separate thread and we will provide you an answer there shortly.