That's originally what I have (without mask), the non-whitespace check is not performed by validwhen. I wasn't sure if I can use validwhen together with mask. I was able to use validwhen in conjunction with email validator though.
You can use validwhen and mask together. The problem is the specific mask you are putting in, which is basically saying that the field is always required. A different mask may indeed work, just not to solve your problem.
Matt
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